236 results on '"Piedrafita J"'
Search Results
2. Genetic relationships in Spanish dog breeds. I. The analysis of morphological characters
- Author
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Sanchez A, Piedrafita J, and Jordana J
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Animal culture ,SF1-1100 ,Genetics ,QH426-470 - Published
- 1992
- Full Text
- View/download PDF
3. Bayesian analysis of parent‐specific transmission ratio distortion in seven Spanish beef cattle breeds
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Casellas, J., CañasÁlvarez, J. J., GonzálezRodríguez, A., PuigOliveras, A., Fina, M., Piedrafita, J., Molina, A., Díaz, C., Baró, J. A., and Varona, L.
- Published
- 2017
- Full Text
- View/download PDF
4. Parametric bootstrap for testing model fitting of threshold and grouped data models: an application to the analysis of calving ease of Bruna dels Pirineus beef cattle
- Author
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Tarres, J., Fina, M., and Piedrafita, J.
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Beef cattle -- Research ,Cattle -- Breeding ,Cattle -- Research ,Zoology and wildlife conservation - Abstract
The aim of this study was to compare the goodness of fit of the threshold models with homoscedasticity or heteroscedasticity and the grouped data model for the analysis of calving ease in beef cattle by using a parametric bootstrap procedure. Field data included 8,205 records of the Bruna dels Pirineus beef cattle breed in the Pyrenean mountain areas of Catalonia (Spain). The actual distribution was 81.81% of calvings without assistance, 11.02% slightly assisted by the farmer, 5.12% strongly assisted by the farmer, 0.89% assisted by the veterinarian, and 1.16% cesarean, but these percentages were very different in the different herds. This can be explained partially by the different subjective way of scoring of each farmer. Primiparous cows had a greater (P < 0.001) difficulty calving than cows with 5 or more parities (11.74 vs. 4.49% of calvings strongly assisted by the farmer or the veterinarian and 2.8 vs. 0.65% cesarean). Male calves caused greater (P < 0.001) calving difficulty than females (7.71% of male calvings strongly assisted by the farmer or the veterinarian vs. 4.25% of females and 1.83% cesarean in males vs. 0.47% in females). The month and year of calving also had a strong influence on calving ease. These data were analyzed using 3 different models: the threshold models with homoscedasticity or heteroscedasticity and the grouped data model. The bootstrap comparison among models suggested that the threshold models, even allowing for heteroscedasticity, did not fit the herd effects well. In contrast, fitting deficiencies were not observed for the grouped data model in any factor. The variance of direct effect of the calf was estimated using the 3 models, and the heritability estimate ranged from 0.165 for the grouped data model to 0.185 for the hereroscedastic threshold model. This heritability was moderate, but it would justify the inclusion of direct effects of the calf on calving ease in the breeding objective. Overall, results highlighted the flexibility of the grouped data model for the analysis of discrete traits, like calving ease of beef calves. Key words: beef cattle, bootstrap, calving ease, grouped data model, heritability, threshold model doi: 10.2527/jas.2009-2720
- Published
- 2010
5. Accounting for additive genetic mutations on litter size in Ripollesa sheep
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Casellas, J., Caja, G., and Piedrafita, J.
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Gene mutations -- Research ,Sheep -- Growth ,Sheep -- Genetic aspects ,Company growth ,Zoology and wildlife conservation - Abstract
Little is known about mutational variability in livestock, among which only a few mutations with relatively large effects have been reported. In this manuscript, mutational variability was analyzed in 1,765 litter size records from 404 Ripollesa ewes to characterize the magnitude of this genetic source of variation and check the suitability of including mutational effects in genetic evaluations of this breed. Threshold animal models accounting for additive genetic mutations were preferred to models without mutational contributions, with an average difference in the deviance information criterion of more than 5 units. Moreover, the statistical relevance of the additive genetic mutation term was checked through a Bayes factor approach, which showed that the models with mutational variability were 8.5 to 22.7 times more probable than the others. The mutational heritability (percentage of the phenotypic variance accounted for by mutational variance) was 0.6 or 0.9%, depending on whether genetic dominance effects were accounted for by the analytical model. The inclusion of mutational effects in the genetic model for evaluating litter size in Ripollesa ewes called for some minor modifications in the genetic merit order of the individuals evaluated, which suggested that the continuous uploading of new additive mutations could be taken into account to optimize the selection scheme. This study is the first attempt to estimate mutational variances in a livestock species and thereby contribute to better characterization of the genetic background of productive traits of interest. Key words: animal breeding, genetic variability, litter size, mutation, Ripollesa breed doi: 10.2527/jas.2009-2117
- Published
- 2010
6. Analysis of founder-specific inbreeding depression on birth weight in Ripollesa lambs
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Casellas, J., Piedrafita, J., Caja, G., and Varona, L.
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Lambs -- Growth ,Lambs -- Diseases ,Birth size -- Measurement ,Birth weight -- Measurement ,Inbreeding -- Research ,Company growth ,Zoology and wildlife conservation - Abstract
Although inbreeding (F) is a topic of major concern in animal breeding, estimates of inbreeding depression are usually obtained by modeling the overall F coefficient of each individual, without considering that the recessive (deleterious) genetic load of a given population may be unevenly distributed among the founder genomes. The founder-specific partial F coefficient is calculated as the identity-by-descent probability at any given autosomal locus related to a particular founder and allows a more detailed analysis of inbreeding depression on productive traits. Within this context, birth BW data from 2,459 Ripollesa lambs were analyzed under a hierarchical animal model without F-related covariates (model 0), with inbreeding depression modeled by the overall F coefficient (model F1), or by the partial F coefficient of 9 founders that made a relevant contribution to the population inbreeding (model F2). A straightforward empirical Bayes factor (BF) was developed for testing statistical relevance of each F-related covariate, in which greater-than-1 values favored the model including the covariate. The deviance information criterion (DIC) clearly supported model F1 (5,767.8) rather than model 0 (5,771.2), suggesting that inbreeding depression had a relevant influence on birth BW data. The linear effect of inbreeding depression was statistically relevant in model F1 (BF = 2.52 x [10.sup.35]), with lamb birth BW declining by -13.6 g with each 1% F increase. The quadratic effect of inbreeding depression was almost null in model F1 (BF = 0.02), as suggested by the reduction in DIC (5,766.9) when this effect was removed from model F1. On the other hand, model F2 provided a similar DIC (5,767.9) value, with this parameter decreasing to 5,764.7 when nonrelevant founder-specific inbreeding depression effects were removed. Substantial heterogeneity in founder-specific inbreeding depression was reported by model F2, in which estimates for 4 of the 9 founders did not differ from zero (BF between 0.05 and 0.42), whereas 5 founders originated moderate (-8.2 g for each 1% F increase; BF = 1.42) to large inbreeding depression (-96.2 g for each 1% F increase; BF = 8.80 x [10.sup.19]). The substantial variability between founder estimates suggested that inbreeding depression effects may mainly be due to a few alleles with major deleterious effects. These results contribute valuable information that should help to achieve more accurate management of inbreeding in the Ripollesa breed. Key words: birth weight, empirical Bayes factor, founder, inbreeding depression, Ripollesa sheep
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- 2009
7. Analysis of litter size and days to lambing in the Ripollesa ewe. II. Estimation of variance components and response to phenotypic selection on litter size
- Author
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Casellas, J., Caja, G., Ferret, A., and Piedrafita, J.
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Bayesian statistical decision theory -- Usage ,Ewes -- Genetic aspects ,Ewes -- Research ,Genetic variation -- Research ,Zoology and wildlife conservation - Abstract
A performance data set from 376 Ripollesa purebred ewes of the experimental flock of the Universitat Autbnoma of Barcelona was analyzed using a bivariate Bayesian threshold-linear model. The data set contained 1,598 litter size records and 1,699 days-to-lambing records. The model included the additive genetic effect of each animal and 3 nongenetic sources of variation: ewe age, year of lambing, and the permanent environmental effect characterized by the ewe. The flock was phenotypically selected for litter size since 1986, and replacement ewes and rams were selected from the progeny of the more prolific ewes, which had at least 3 deliveries recorded. The phenotypic trend for litter size was positive, whereas days to lambing followed an unclear pattern. Both traits had low heritabilities; 0.13 for litter size and 0.11 for days to lambing. Response to selection was evaluated through (a) the average breeding value of the ewe lambs chosen annually, and (b) the average breeding value of the overall flock. The first measurement suggested a positive trend for litter size, although it showed important oscillations. On the other hand, the average breeding value for the overall flock showed a stable positive tendency after yr 4 of selection, with estimates clearly different from zero after yr 11 of selection. A significant increase in the incidence of multiple births was observed, with a mode of approximately 10%. The correlated response in days to lambing did not show a significant trend. The effect of year of lambing also positively influenced both litter size and days to lambing, although important oscillations were observed between years. Results indicated that litter size in sheep can be effectively improved through phenotypic selection, even in small flocks; moreover, days to lambing could also be genetically improved, given the estimate obtained for its heritability. Key words: Bayesian inference, days to lambing, genetic trend, litter size, Ripollesa sheep, threshold models
- Published
- 2007
8. Analysis of litter size and days to lambing in the Ripollesa ewe. I. Comparison of models with linear and threshold approaches
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Casellas, J., Caja, G., Ferret, A., and Piedrafita, J.
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Ewes -- Genetic aspects ,Ewes -- Research ,Zoology and wildlife conservation - Abstract
The analysis focused on model fitting of 2 ewe reproductive traits, litter size, and days to lambing (interval between the introduction of the ram into the flock and the subsequent parturition of the ewes). The experimental data set of the Universitat Autonoma of Barcelona flock was used, including 1,598 records of litter size and 1,699 records of days to lambing from 376 Ripollesa ewes between 1986 and 2005. Univariate and bivariate models were considered as beginning points with linear or threshold approximation for litter size. Model fitting was evaluated in terms of goodness-of-fit and predictive ability, using the mean square error and the correlation between phenotypic and predicted records ([[rho].sub.y,x]) as reference parameters. The bivariate model was preferable for both variables, minimizing mean square error and maximizing [[rho].sub.y,x]. A threshold approximation for litter size was preferable over a linear approximation. Models were also compared with a simulation study, comparing the correlation coefficient between simulated and predicted breeding values ([[rho].sub.a,[??]). The bivariate threshold model was favored, with a [[rho].sub.y,[??]] of 0.677 and 0.834 for litter size and days to lambing, respectively. Correlation coefficients between simulated and predicted breeding values in the bivariate linear model were reduced slightly to 0.651 and 0.831, respectively, and they were lowest with linear univariate models (0.642 and 0.802). Although the bivariate models for ewe litter size and days to lambing were more accurate than the univariate models, the threshold approaches showed a greater advantage under the bivariate model. For the purpose of genetic evaluation of litter size in sheep, use of the threshold-linear model seems justified. In the Ripollesa breed, the evaluation of litter size can benefit from recording birth weight. Key words: days to lambing, goodness-of-fit, litter size, predictive ability, Ripollesa breed
- Published
- 2007
9. Association analyses between the prion protein locus and reproductive and lamb weight traits in Ripollesa sheep
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Casellas, J., Caja, G., Bach, R., Francino, O., and Piedrafita, J.
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Prions -- Research ,Sheep breeds -- Genetic aspects ,Sheep breeds -- Research ,Sheep breeds -- Physiological aspects ,Birth size -- Research ,Birth weight -- Research ,Haplotypes -- Research ,Zoology and wildlife conservation - Abstract
The objective of this study was to analyze the association between the haplotypes of the prion protein (PrP) locus and several reproductive and lamb weight traits in Ripollesa sheep. Prion protein genotypes were available for a total of 310 sheep (7 rams, 114 ewes, and 189 lambs), all of them belonging to the purebred Ripollesa flock of the Universitat Autbnoma of Barcelona, for which all sheep had a known pedigree. In addition, the genotype of 24 historical descendants of the previously genotyped adult individuals was reconstructed, provided that both parents were homozygous for PrP haplotypes. Only 3 haplotypes (ARR, ARQ, and ARH) were observed in the PrP locus of the sheep sampled. Reproductive traits included conception rate and litter size, whereas birth BW and 90-d BW were the lamb weight traits studied. The additive effect of PrP haplotypes was analyzed through Bayesian animal threshold and linear models, for reproduction and weight traits, respectively. Ewe reproductive data belonged to 89 ewes that gave 492 conception rate records and 440 litter size records. Analyses of BW at birth and at 90 d of age were made on 323 and 164 lamb records, respectively. No associations between PrP haplotypes and conception rate and BW traits were observed. For litter size, the effect of the ARH haplotype was greater than that of the ARQ haplotype. Differences between ARH and ARR haplotypes also suggested an advantage for the ARH. As a whole, our results indicated that the selection favorable to increase litter size in Ripollesa ewes may also increase the ARH haplotype frequency, which contradicts the recommendations of the current European Union legislation aiming to increase the genetic resistance to scrapie. As a consequence, scrapie genotyping needs to be included as a new selection criterion in the breed. Key words: birth weight, conception rate, litter size, prion protein, Ripollesa breed, sheep
- Published
- 2007
10. Survival analysis from birth to slaughter of Ripollesa lambs under semi-intensive management
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Casellas, J., Caja, G., Such, X., and Piedrafita, J.
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Lambs -- Research ,Life spans (Biology) -- Research ,Livestock -- Breeding ,Livestock -- Research ,Zoology and wildlife conservation - Abstract
The survivability from birth to slaughter of 1,487 Ripollesa lambs with a preslaughter overall mortality of 9.6% was studied under the proportional hazards framework, assuming a Weibull distribution for the baseline hazards function. A sire frailty model was fitted, with the common environment received by the lamb as an additional random source of variation. Common environment was considered time-dependent and was characterized by the dam and the contemporary lamb group during the preweaning and fattening periods, respectively. Only 3 fixed effects were statistically significant: the linear and quadratic effects of birth weight (P [less than or equal to] 0.001), the relative position of the delivery within the lambing season (P [less than or equal to] 0.001), and the presence of stillbirths or mummified fetuses within the litter (P [less than or equal to] 0.05). Birth type and parity of the ewe were significant only when birth weight was removed from the model (P [less than or equal to] 0.001 and P [less than or equal to] 0.05, respectively). Nevertheless, the model including birth weight became preferable according to the Akaike's information criterion. Survivability dramatically decreased with extreme birth weights, although it reached a survival probability greater than 93.5% within the 3.3 to 5.4 kg range, indicating an optimum birth weight range of Ripollesa lambs for survival purposes. The hazard ratio (HR) increased for births occurring within the last third of the lambing period (HR = 1.70; P [less than or equal to] 0.05), as well as for primiparous ewes that lambed in December and January (HR = 5.36; P [less than or equal to] 0.001). Survival probability decreased for lambs born from litters with 1 or more stillbirths or mummified fetuses (HR = 1.61; P [less than or equal to] 0.05). The variance component estimated for sire variance (0.07) was clearly lower than that of the common environment (1.87), with a heritability estimate of 0.027. Key words: lamb survival, proportional hazard, Ripollesa breed, survival analysis
- Published
- 2007
11. Parametric bootstrap for testing model fitting in the proportional hazards framework: an application to the survival analysis of Bruna dels Pirineus beef calves
- Author
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Casellas, J., Tarres, J., Piedrafita, J., and Varona, L.
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Beef -- Research ,Monte Carlo method -- Usage ,Cattle ,Zoology and wildlife conservation - Abstract
Given that correct assumptions on the baseline survival function are determinant for the validity of further inferences, specific tools to test the fit of a model to real data become essential in proportional hazards models. In this sense, we have proposed a parametric bootstrap to test the fit of survival models. Monte Carlo simulations are used to generate new data sets from the estimates obtained through the assumed models, and then bootstrap intervals can be established for the survival function along the time space studied. Significant fitting deficiencies are revealed when the real survival function is not included within the bootstrap interval. We tested this procedure in a survival data set of Bruna dels Pirineus beef calves, assuming 4 parametric models (exponential, Weibull, exponential time-dependent, Weibull time-dependent) and the Cox's semiparametric model. Fitting deficiencies were not observed for the Cox's model and the exponential time-dependent model, whereas the Weibull time-dependent model suffered from moderate overestimation at different ages. Thus, the exponential time-dependent model appears to be preferable because of its correct fit for survival data of beef calves and its smaller computational and time requirements. Exponential and Weibull models were completely rejected due to the continuous over- and underestimation of the survival probability reported. Results here highlighted the flexibility of parametric models with time-dependent effects, achieving a fit comparable to nonparametric models. Key words: model fitting, parametric bootstrap, proportional hazard, survival analysis
- Published
- 2006
12. Genetic and environmental factors influencing mortality up to weaning of Bruna dels Pirineus beef calves in mountain areas. A survival analysis
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Tarres, J., Casellas, J., and Piedrafita, J.
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Beef cattle -- Research ,Beef cattle -- Food and nutrition ,Zoology and wildlife conservation - Abstract
Survival analysis techniques were used to analyze survival up to weaning of beef calves in the Pyrenean mountains areas of Catalonia, Spain. The Kaplan-Meier curve showed that the survival experience was not constant throughout the lactation period, as the mortality rate was more pronounced during the first month of life. The proportional hazards model analysis showed that several factors influenced the instantaneous mortality rate, with the herd-year effect having the strongest influence. Calves born in the first part of the breeding season, from September to February, had the lowest mortality risk (P < 0.001), showing that mortality risk increases as births accumulate. Calves from cows younger than 1,300 d of productive life had a higher risk of mortality (P < 0.05). Unassisted calvings presented the smallest risk of mortality, and mortality risk increased up to five times as birth became more difficult (P < 0.001). This risk also tended to increase slightly when calf birth weight was small (P < 0.10); for bigger calves, no increase of risk was detected, probably because calving difficulty was included in the model. These results suggest the need for improving the environment in the second part of the breeding period and paying more attention to births from younger cows. The survival curve fitted a parametric piecewise exponential function very well, with cut points at 16 and 32 d. The lower risk corresponded to the period of 33 to 180 d, the risk for the periods 17 to 32 d and I to 16 d being multiplied by 7 and 26, respectively. Confirming the robustness of the Cox model, the relative risks estimated for the different factors under this piecewise exponential model or a Weibull time-dependent model were similar to those reported above, as well as to those estimated under a frailty model, including the sire as a random effect. The modal estimates of sire variance under different baseline functions were close to 0.3, although the standard errors were very large. At weaning, the heritability estimate in the binary scale reached a value of only 0.037 because the survival at weaning was very high (96.9%) in this population. Nevertheless, in populations with a higher mortality, the inclusion of survival to weaning in the breeding objective might be justified. Overall, these results show that survival analysis is a powerful tool to analyze the mortality curve until weaning of beef calves. Key Words: Beef Cattle, Heritability, Survival Analysis, Survival to Weaning
- Published
- 2005
13. Bayes factor analysis for the genetic background of physiological and vitality variables of [F.sub.2] Iberian x Meishan newborn piglets
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Varona, L., Casellas, J., Piedrafita, J., Sanchez, A., Garcia-Casado, P., Arque, M., and Noguera, J.L.
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Swine -- Research ,Genetic research ,Zoology and wildlife conservation - Abstract
The Bayes factor (BF) procedure was applied to examine the additive genetic component of several physiological and vitality variables for newborn pigs. Nine variables were studied: heart rate, arterial oxygen saturation, rectal temperature (all at birth and 60 min later), birth weight, interval between birth and first teats contact, and interval between birth and first colostrum intake. The available numbers of data ranged from 288 (heart rate at 60 min) to 839 records (birth weight) from [F.sub.2] Iberian x Meishan newborn pigs. We compared a model with zero heritability (nonheritable) with the one where the additive genetic background was included. The BF was used to discriminate between both candidate models. Very strong evidence of genetic background was detected for heart rate 60 min after birth (BF = 48.90), and strong evidence was detected for rectal temperature at birth (BF = 13.82). Posterior modes (means) of heritabilities were 0.29 (0.32) and 0.40 (0.39), respectively. In addition, substantial evidence of absence of genetic background was detected for arterial oxygen saturation at birth. Key Words: Bayes Factor, Neonate Metabolism, Survival, Vitality
- Published
- 2005
14. Viability of Iberian x Meishan [F.sub.2] newborn pigs. II. Survival analysis up to weaning
- Author
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Casellas, J., Noguera, J.L., Varona, L., Sanchez, A., Arque, M., and Piedrafita, J.
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Swine -- Research ,Zoology and wildlife conservation - Abstract
Iberian x Meishan [F.sub.2] piglet's preweaning survivability was analyzed using categorical data regression procedures within the proportional hazards assumption. A frailty sire model was assumed with the litter effect treated as an additional random source of variation. Moreover, the relative birth weight within litter and the litter effect were considered time-dependent covariates that changed their values in the second day of life due to cross fostering carried out to standardize litters. Six variables had a significant effect on survivability: birth weight (P < 0.01), relative birth weight within litter (P < 0.001), rectal temperature 60 min after birth (P < 0.01), type of presentation at birth (P < 0.05), presence of stillbirths (P < 0.001), and presence of mummified fetuses (P < 0.001). Small piglets ( Key Words: Categorical Survival Analysis, [F.sub.2] Piglets, Preweaning Survival, Proportional Hazards
- Published
- 2004
15. Viability of Iberian x Meishan [F.sub.2] newborn pigs. I. Analysis of physiological and vitality variables
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Casellas, J., Rauw, W.M., Piedrafita, J., Sanchez, A., Arque, M., and Noguera, J.L.
- Subjects
Swine -- Research ,Zoology and wildlife conservation - Abstract
Eight physiological and vitality variables related to the first minutes of the life of Iberian x Meishan [F.sub.2] piglets were analyzed. Variables included rectal temperature, arterial oxygen saturation, heart rate (all were monitored at birth and 60 min later), time to reach the udder, and time to the first colostrum intake. Litter effect within boar, a random source of variation, influenced all variables, whereas the random boar effect was not significant for heart rate and arterial oxygen saturation at birth and the time to reach the udder. Birth weight influenced rectal temperature at birth (P < 0.01) and 60 min later (P < 0.001), arterial oxygen saturation 1 h after birth (P < 0.05), heart rate 1 h after birth (P < 0.001), time to reach the udder (P < 0.05), and time to the first suckle (P < 0.01), whereas viability score influenced rectal temperatures (at birth and 60 min later; P < 0.001), and time to reach the udder (P < 0.001) and to suckle (P < 0.001). Finally, the order of birth showed significant effects for rectal temperature 1 h after birth (P < 0.001) and time to first colostrum intake (P < 0.001). Correlation coefficients between physiological variables were generally low, with the exception of the ones for rectal temperature 1 h after birth and arterial oxygen saturation 1 h after birth (0.38; P < 0.001), and for rectal temperature at birth and rectal temperature i h after birth (0.34; P < 0.001). Times to reach the udder and to suckle were highly correlated (0.67; P < 0.001) and also were moderately and negatively correlated with rectal temperature 1 h after birth (-0.36 and -0.38 respectively; P < 0.001). Heart rates at birth and i h later, as well as arterial oxygen saturation at birth and 1 h later, were not correlated, showing that the values at birth do not necessarily provide information about the physiological status of the pig 1 h after birth. The recording of physiological variables, birth weight, and viability score may be useful to identify weak piglets quickly and to establish palliative measures. Key Words: Physiological Variables, Piglets, Postnatal Period, Viability
- Published
- 2004
16. Effect of fibrous diet and vitamin C inclusion on uniformity, carcass traits, skeletal strength, and behavior of broiler breeder pullets
- Author
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Asensio, X., primary, Abdelli, N., additional, Piedrafita, J., additional, Soler, M.D., additional, and Barroeta, A.C., additional
- Published
- 2020
- Full Text
- View/download PDF
17. Effect of body weight on uniformity, livability, and skeletal development and strength of broiler breeder females
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Asensio, X., primary, Piedrafita, J., additional, Puente, A., additional, and Barroeta, A. C., additional
- Published
- 2020
- Full Text
- View/download PDF
18. Maternal Animal Model with Correlation Between Maternal Environmental Effects of Related Dams
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Quintanilla, R., Varona, L., Pujol, M.R., and Piedrafita, J.
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Mares -- Research ,Parental behavior in animals -- Analysis ,Bayesian statistical decision theory -- Models ,Beef cattle -- Research ,Zoology and wildlife conservation - Abstract
A procedure to take into account the nongenetic relationship between maternal effects in adjacent generations is presented. It considers a correlation between maternal environments provided by a dam and its daughters (lambda). The dispersion structure of the maternal animal model was modified to include a correlation matrix (E) that relates the maternal permanent environmental effects. The structures of the E matrix and its inverse (E(super -1) are described. Both matrices are completely defined by the correlation coefficient (lambda). An algorithm to compute these matrices from pedigree information was also developed. Furthermore, a Bayesian analysis of this model including the (lambda) parameter was developed using Gibbs sampling, with Metropolis steps for the nonstandard conditional distributions. With simulated data, the proposed model reduced the bias in all estimates of dispersion parameters when an antagonism between the maternal effects received by a daughter and its future maternal environment existed. This model also provides an estimate of the environmental relationship between the maternal effects of dams and daughters by the (lambda) parameter. The same Bayesian analysis was also carried out with weaning weight data of the Bruna dels Pirineus breed. The posterior means (standard deviation) of (co)variance ratios were .214 (.081) for direct heritability (h(super 2)(sub d)), .107 (.033) for maternal heritability (h(super 2)(sub m)), .047 (.020) for the proportion of variance due to maternal environmental effects (C(super 2)(sub m)), and -.034 (.043) for the genetic correlation between direct and maternal effects (r(sub dm)). The posterior mean of (lambda) parameter was -.190, and 76% of its marginal posterior distribution took negative values. As occurred with simulated data, considering the maternal environmental correlation in the analysis implied higher h(super 2)(sub m)estimates, lower C(super 2)(sub m) and h(super 2)(sub d) estimates, and less negative values for the marginal posterior distribution of r(sub dm). These results were considered as evidence of the environmental antagonism between maternal effects provided by a dam and its daughters to weaning weight of their progeny in the Bruna dels Pirineus breed. Key Words: Maternal Effects, Bayesian Theory, Gibbs Sampling, Beef Cattle, Weaning Weight
- Published
- 1999
19. Effect of medium- and long-chain triglyceride supplementation on small newborn-pig survival
- Author
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Casellas, J., Casas, X., Piedrafita, J., and Manteca, X.
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- 2005
- Full Text
- View/download PDF
20. Genetic relationships in Spanish dog breeds. II. The analysis of biochemical polymorphism
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Jordana, J, Piedrafita, J, and Sanchez, A
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- 1992
- Full Text
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21. Genetic relationships in Spanish dog breeds. I. The analysis of morphological characters
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Jordana, J, Piedrafita, J, and Sanchez, A
- Published
- 1992
- Full Text
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22. Comparative F statistics analysis of the genetic structure of ten Spanish dog breeds
- Author
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Jordana, J., Piedrafita, J., Sanchez, A., and Puig, P.
- Subjects
Dogs -- Genetic aspects ,Genetic polymorphisms -- Research ,Chromosomes -- Analysis ,Biological sciences - Abstract
A study was done on the genetic structure of ten Spanish dogs using comparative F statistics analysis. Electrophoretic data showed that 11 out of the 21 loci are polymorphic. Heterozygote deficit was measured to be 17% at the subpopulation, breed and ancenstral trunk levels. It was concluded that F statistics can be used for the analysis of the genetic structure of the Spanish dog populations and the reconstruction of phylogenies.
- Published
- 1992
23. Detection of genomic regions with high linkage disequilibrium in Spanish Beef Cattle Populations by BovineHD BeadChip analysis
- Author
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Mouresan, E. F., González-Rodríguez, A., Munilla, S., Moreno, C., Altarriba, J., Díaz, C., Baró, J. A., Piedrafita, J., Molina, A., Cañas-Álvarez, J. J., and Varona, L.
- Subjects
Linkage disequilibrium ,Beef cattle - Abstract
The objective of this study was to evaluate the pattern of linkage disequilibrium along the genome in seven autochthonous Spanish cattle beef populations (Asturiana de los Valles, Avileña Negra-Ibérica, Bruna dels Pirineus, Morucha, Pirenaica, Retinta and Rubia Gallega). The BovineHD BeadChip was used to genotype 171 trios of individual/sire/dam. 573,134 SNPs were available after filtering. With this information, a parameter that measures the mean disequilibrium of the genome in regions of 1 Mb in each population was defined. The results show that the linkage disequilibrium is very heterogeneous along the genome, and this heterogeneity is consistent among the considered populations. The causes of this heterogeneity could be structural, and attributed to a lower mutation rate and/or recombination rate, or a result of stabilizing selection. © 2017, Universidad de Cordoba,Servicio de Publicaciones. All rights reserved.
- Published
- 2017
24. Evaluation of the potential use of a meta-population for genomic selection in autochthonous beef cattle populations
- Author
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Mouresan, E.F., primary, Cañas-Álvarez, J.J., additional, González-Rodríguez, A., additional, Munilla, S., additional, Altarriba, J., additional, Díaz, C., additional, Baró, J.A., additional, Molina, A., additional, Piedrafita, J., additional, and Varona, L., additional
- Published
- 2018
- Full Text
- View/download PDF
25. Linkage disequilibrium, persistence of phase, and effective population size in Spanish local beef cattle breeds assessed through a high-density single nucleotide polymorphism chip
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Cañas-Álvarez, J. J., Mouresan, E. F., Varona, L., Díaz, C., Molina, A., Baró, J. A., Altarriba, J., Carabaño, M. J., Casellas, J., and Piedrafita, J.
- Subjects
Effective population size ,High-density single nucleotide polymorphism chip ,Beef breeds ,Linkage disequilibrium ,Persistence of phase - Abstract
Linkage disequilibrium (LD) and persistence of phase are fundamental approaches for exploring the genetic basis of economically important traits in cattle, including the identification of QTL for genomic selection and the estimation of effective population size (Ne) to determine the size of the training populations. In this study, we have used the Illumina BovineHD chip in 168 trios of 7 Spanish beef cattle breeds to obtain an overview of the magnitude of LD and the persistence of LD phase through the physical distance between markers. Also, we estimated the time of divergence based on the persistence of the LD phase and calculated past Ne from LD estimates using different alternatives to define the recombination rate. Estimates of average r2 (as a measure of LD) for adjacent markers were close to 0.52 in the 7 breeds and decreased with the distance between markers, although in long distances, some LD still remained (0.07 and 0.05 for markers 200 kb and 1 Mb apart, respectively). A panel with a lower boundary of 38,000 SNP would be necessary to launch a successful within-breed genomic selection program. Persistence of phase, measured as the pairwise correlations between estimates of r in 2 breeds at short distances (10 kb), was in the 0.89 to 0.94 range and decreased from 0.33 to 0.52 to a range of 0.01 to 0.08 when marker distance increased from 200 kb to 1 Mb, respectively. The magnitude of the persistence of phase between the Spanish beef breeds was similar to those found in dairy breeds. For across-breed genomic selection, the size of the SNP panels must be in the range of 50,000 to 83,000 SNP. Estimates of past Ne showed values ranging from 26 to 31 for 1 generation ago in all breeds. The divergence among breeds occurred between 129 and 207 generations ago. The results of this study are relevant for the future implementation of within- and across-breed genomic selection programs in the Spanish beef cattle populations. Our results suggest that a reduced subset of the SNP panel would be enough to achieve an adequate precision of the genomic predictions. © 2016 American Society of Animal Science. All rights reserved.
- Published
- 2016
26. On the haplotype diversity along the genome in Spanish beef cattle populations
- Author
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Mouresan, E.F., primary, González-Rodríguez, A., additional, Cañas-Álvarez, J.J., additional, Díaz, C., additional, Altarriba, J., additional, Baro, J.A., additional, Piedrafita, J., additional, Molina, A., additional, Toro, M.A., additional, and Varona, L., additional
- Published
- 2017
- Full Text
- View/download PDF
27. Detección de regiones genómicas con elevado desequilibrio de ligamiento en poblaciones de vacuno de carne españolas con análisis de BovineHD BeadChip
- Author
-
Mouresan, E.F., primary, González-Rodríguez, A., additional, Munilla, S., additional, Moreno, C., additional, Altarriba, J., additional, Díaz, C., additional, Baro, J.A., additional, Piedrafita, J., additional, Molina, A., additional, Cañas-Álvarez, J.J., additional, and Varona, L., additional
- Published
- 2017
- Full Text
- View/download PDF
28. Genomic differentiation between Asturiana de los Valles, Avileña-Negra Ibérica, Bruna dels Pirineus, Morucha, Pirenaica, Retinta and Rubia Gallega cattle breeds
- Author
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González-Rodríguez, A., primary, Munilla, S., additional, Mouresan, E.F., additional, Cañas-Álvarez, J.J., additional, Baro, J.A., additional, Molina, A., additional, Díaz, C., additional, Altarriba, J., additional, Piedrafita, J., additional, and Varona, L., additional
- Published
- 2017
- Full Text
- View/download PDF
29. 0350 Using LD structure of several populations to optimize an SNP panel for conservation and selection
- Author
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Díaz, C., primary, Varona, L., additional, Carabaño, M. J., additional, Nicolazzi, E., additional, Bichard, M., additional, Baro, J., additional, Molina, A., additional, Piedrafita, J., additional, Rossoni, A., additional, Schwarzenbacher, H., additional, Seyfried, F., additional, Solberg, T. R., additional, Vicario, D., additional, Altarriba, J., additional, and Abraham, K. J., additional
- Published
- 2016
- Full Text
- View/download PDF
30. Genetic diversity and divergence among Spanish beef cattle breeds assessed by a bovine high-density SNP chip
- Author
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Cañas-Álvarez, J. J., González-Rodríguez, A., Munilla, S., Varona, L., Díaz, C., Baró, J. A., Altarriba, J., Molina, A., and Piedrafita, J.
- Subjects
Heterozygosity ,Genetic distances ,Beef breeds ,Neighbor joining trees ,Admixture ,Single nucleotide polymorphism variability - Abstract
The availability of SNP chips for massive genotyping has proven to be useful to genetically characterize populations of domestic cattle and to assess their degree of divergence. In this study, the Illumina BovineHD BeadChip genotyping array was used to describe the genetic variability and divergence among 7 important autochthonous Spanish beef cattle breeds. The within-breed genetic diversity, measured as the marker expected heterozygosity, was around 0.30, similar to other European cattle breeds. The analysis of molecular variance revealed that 94.22% of the total variance was explained by differences within individuals whereas only 4.46% was the result of differences among populations. The degree of genetic differentiation was small to moderate as the pairwise fixation index of genetic differentiation among breeds (FST) estimates ranged from 0.026 to 0.068 and the Nei᾿s D genetic distances ranged from 0.009 to 0.016. A neighbor joining (N-J) phylogenetic tree showed 2 main groups of breeds Pirenaica, Bruna dels Pirineus, and Rubia Gallega on the one hand and Avile�a-Negra Ib�rica, Morucha, and Retinta on the other. In turn, Asturiana de los Valles occupied an independent and intermediate position. A principal component analysis (PCA) applied to a distance matrix based on marker identity by state, in which the first 2 axes explained up to 17.3% of the variance, showed a grouping of animals that was similar to the one observed in the N-J tree. Finally, a cluster analysis for ancestries allowed assigning all the individuals to the breed they belong to, although it revealed some degree of admixture among breeds. Our results indicate large within-breed diversity and a low degree of divergence among the autochthonous Spanish beef cattle breeds studied. Both N-J and PCA groupings fit quite well to the ancestral trunks from which the Spanish beef cattle breeds were supposed to derive. � 2015 American Society of Animal Science. All rights reserved.
- Published
- 2015
31. Monitoring changes in the demographic and genealogical structure of the main Spanish local beef breeds
- Author
-
Cañas-Álvarez, J. J., Gónzalez-Rodríguez, A., Martín-Collado, D., Avilés, C., Altarriba, J., Baró, J. A., De La Fuente, L. F., Díaz, C., Molina, A., Varona, L., and Piedrafita, J.
- Subjects
Beef cattle ,Local breeds ,Inbreeding ,Pedigree - Abstract
Demographic and pedigree analyses describe the structure and dynamics of livestock populations. We studied information recorded in the herdbooks of Asturiana de los Valles (AV; N = 458,806), Avileña–Negra Ibérica (ANI; N = 204,623), Bruna dels Pirineus (BP; N = 62,138), Morucha (Mo; N = 65,350), Pirenaica (Pi; N = 217,428), Retinta (Re; N = 135,300), and Rubia Gallega (RG; N = 235,511) beef breeds from their creation until 2009. All breeds have increased in the number of registered cows in recent years. In all breeds, herds do not behave as isolated entities and a high rate of exchange of breeding males between herds exists. A percentage of herds (12–52%) make some type of selection and sell bulls to other herds. There were large differences in average number of progeny per bull, ranging from 15.6 (AV) to 373.7 animals (RG, with a high incidence of AI). Generation interval estimates ranged from 4.7 (AV) to 7.6 (RG) yr in the sire pathway and from 5.95 (AV) to 7.8 (Mo) yr in the dam pathway. Density of pedigrees varied among breeds, with Pi, ANI, and Re having the more dense pedigrees, with average completeness indexes of more than 96% in the first generation and 80% when 6 generations were considered. A general increase in average inbreeding was observed in all breeds in the years analyzed. For animals born in 2009, average inbreeding coefficients ranged from 0.6 (BP) to 7.2% (Re) when all animals were considered and from 3.6 (Pi) to 17.6% (BP) when only inbred animals were considered. Due to the lack of completeness of pedigrees in most populations, inbreeding coefficients may be considered as a lower bound of the true parameters. The proportion of inbred animals tended to increase in the periods analyzed in all breeds. Differences between inbreeding and coancestry rates (except in RG) suggest the presence of population structure. Effective population size (Ne) based on the inbreeding rate estimated by regression ranged from 43 to 378 for Re and BP, whereas Ne estimates based on coancestry were greater, with a range of 100 for RG to 9,985 for BP. These facts suggest that an adequate mating policy can help to monitor inbreeding so as not to lose genetic variability. Effective number of ancestors in 2009 for 6 of the breeds ranged from 42 (RG) to 220 (AV), with BP having much a greater value, and was lower than was the effective number of founders in all breeds, suggesting the existence of bottlenecks. © 2014 American Society of Animal Science. All rights reserved.
- Published
- 2014
32. Bayesian analysis of parent-specific transmission ratio distortion in seven Spanish beef cattle breeds
- Author
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Casellas, J., primary, Cañas-Álvarez, J. J., additional, González-Rodríguez, A., additional, Puig-Oliveras, A., additional, Fina, M., additional, Piedrafita, J., additional, Molina, A., additional, Díaz, C., additional, Baró, J. A., additional, and Varona, L., additional
- Published
- 2016
- Full Text
- View/download PDF
33. Linkage disequilibrium, persistence of phase, and effective population size in Spanish local beef cattle breeds assessed through a high-density single nucleotide polymorphism chip1
- Author
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Cañas-Álvarez, J. J., primary, Mouresan, E. F., additional, Varona, L., additional, Díaz, C., additional, Molina, A., additional, Baro, J. A., additional, Altarriba, J., additional, Carabaño, M. J., additional, Casellas, J., additional, and Piedrafita, J., additional
- Published
- 2016
- Full Text
- View/download PDF
34. Genetic diversity and divergence among Spanish beef cattle breeds assessed by a bovine high-density SNP chip1
- Author
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Cañas-Álvarez, J. J., primary, González-Rodríguez, A., additional, Munilla, S., additional, Varona, L., additional, Díaz, C., additional, Baro, J. A., additional, Altarriba, J., additional, Molina, A., additional, and Piedrafita, J., additional
- Published
- 2015
- Full Text
- View/download PDF
35. Canalisation analysis of birth weight in Bruna dels Pirineus beef cattle
- Author
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Fina, M., Ibáñez-Escriche, Noelia|||0000-0002-6221-3576, Piedrafita, J., and Casellas, J.
- Subjects
Male ,Models, Genetic ,Bayesian analysis ,Bruna dels Pirineus ,Breeding ,Environment ,PRODUCCION ANIMAL ,Canalization ,Spain ,Birth weight ,Animals ,Cattle ,Female ,Selection, Genetic ,Heterogeneous variance - Abstract
[EN] Although heteroskedasticity has been a main topic of interest in beef cattle during recent decades, the current availability of canalization models provided new insights for animal breeding programs. Within this context, birth BW (BWT) was analyzed in the Bruna dels Pirineus beef cattle breed by implementing canalization models that accounted for heterogeneous residual variances due to 30systematic, permanent environmental effects and additive genetic effects. Analyses were performed on BWT data from 8,130 calves born in 12 commercial breeding herds contributing to the yield recording scheme of the Bruna dels Pirineus breed. Analytical models accounted for direct additive genetic, permanent environmental, and 4 systematic effects (i.e., age of the dam, sex of the calf, birth type, and herd-year-season), and the same effects were evaluated as potential sources of variation in the residual term. Their relevance was checked by the deviance information criterion (DIC), and only residual additive genetic, permanent environmental, birth type, and herd-year-season remained in the operational model, all of them originating relevant reductions in the DIC parameter. Bruna dels Pirineus calves showed a moderate heritability of 0.30 (95% high posterior density, 0.19 to 0.40) for BWT; additional additive genetic variability was revealed in the residual term, this being positively correlated with the direct additive genetic component (0.44; 95% high posterior density, 0.37 to 0.54). Genetic trends were evaluated on both sources of additive genetic variance, and relevant patterns were identified in several herds. Although this breed did not evidence a homogeneous genetic trend for the whole population, herd- specific positive and negative trends were revealed, suggesting the plausibility of genetic selection for canalization on BWT in beef cattle breeds. These results must be viewed as a contribution to the canalization research field, providing relevant information for the breeding scheme of the Bruna dels Pirineus breed, as well as important insights about the genetic background of BWT for the beef industry worldwide., Research was supported by a contract with the Departament d Agricultura, Ramaderia, Pesca, Alimentació i Medi Rural of the Generalitat de Catalunya (Barcelona, Spain). The authors are indebted to the Federació Catalana de la Raça Bruna dels Pirineus (Berga, Spain; http://www.brunadelspirineus.org) and its associates for providing field data for these analyses. The research contract of J. Casellas was partially funded by the Ministerio de Ciencia e Innovación (Madrid, Spain) of the Spanish government (reference RYC-2009-04049).
- Published
- 2013
36. Estructura y relaciones genéticas de la raza bovina Serrana de Teruel con razas explotadas en España
- Author
-
Sanz, A., Rodellar, C., Martín-Burriel, I., Cons, C., Abril, F., Azor, P.J., Piedrafita, J., Vijil, E., and Zaragoza, P.
- Subjects
Microsatélites ,Variabilidad genética ,Microsatellites ,Genetic diversity - Abstract
En este trabajo se analiza la variabilidad genética de la raza autóctona en peligro de extinción Serrana de Teruel, así como su relación con las razas bovinas explotadas en España: Albera, Pajuna, Avileña-Negra Ibérica, Serrana Negra, Pirenaica y Parda de Montaña. La caracterización genética se ha realizado mediante marcadores microsatélites, todos han resultado polimórficos detectándose un total de 198 alelos con una media de 6,79 alelos por locus. Las heterocigosidades observadas y esperadas fueron altas y similares en el equilibrio, con valores de 0,67 y 0,68 respectivamente. A partir del estudio de las relaciones filogenéticas se ha podido observar la cercanía de la raza Serrana de Teruel con las razas de montaña Pirenaica y Parda de Montaña. Mediante el estudio de la estructura genética se observó que el porcentaje de animales correctamente asignados a la Serrana de Teruel para q>0,8 fue del 47,5%, apreciándose una clara influencia de la raza Parda de Montaña en los individuos mezclados. In this work we analyze by microsatellite markers the genetic diversity, structure and relationships of the indigenous endangered Serrana de Teruel cattle breed with different breeds reared in Spain. All loci were polymorphic and a total of 198 alleles were observed across loci, with a mean of 6.79. Observed and expected heterozygosities values shown the high variability of Serrana de Teruel breed with values of 0.67 and 0.68 respectively. The neighbour net based on Reynolds distances shown the close genetic relationship among Serrana de Teruel and the mountain Parda de Montaña and Pirenaica breeds. STRUCTURE results showed a 47.5% of correctly assigned individuals to Serrana de Teruel breed using a q>0.8 threshold. The admixed animals shown a clear influence of Parda de Montaña breed.
- Published
- 2011
37. Reasearch of welfare biomarkers by proteomic approaches in bruna dels prineus cows under different production systems
- Author
-
Marco Ramell, Anna, Arroyo, Laura, Pato, R., Peña, R., Saco, Y., Fina, M., Piedrafita, J., and Bassols, Anna
- Subjects
Sistemas biológicos ,Biotecnología ,Proteómica - Abstract
Comunicaciones a congresos
- Published
- 2011
38. On the breeds of cattle-Historic and current classifications
- Author
-
Felius, M., Koolmees, Peter A., Theunissen, B., Baumung, R., Manatrinon, S., Mommens, G., Holm, L. -E., Withen, K. B., Pedersen, B. V., Gravlund, P., Viinalass, H., Kantanen, J., Tapio, I., M. H., Li, Moazami-Goudarzi, K., Gautier, M., Denis, Laloë, Oulmouden, A., Levéziel, H., Taberlet, P., Harlizius, B., Simianer, H., Täubert, H., Erhardt, G., Jann, O., Weimann, C., Prinzenberg, E. -M., Medugorac, I., Medugorac, A., Förster, M., Mix, H. M., Looft, C., Kalm, E., Bradley, D. G., Edwards, C. J., Machugh, D. E., Freeman, A. R., Ajmone Marsan, P., Negrini, R., Longeri, M., Ceriotti, G., Zanotti, M., Marletta, D., Criscione, A., Valentini, A., Marchitelli, C., Pariset, L., Savarese, M. C., Pilla, F., Grislis, Z., Miceikienė, I., Nijman, I. J., van Haeringen, W., van de Goor, L., Olsaker, I., Ginja, C., Gama, L. T., Mateus, J. C., Beja-Pereira, A., Ferrand, N., Ivanova, Z., Popov, R., Ammosov, I., Kiselyova, T., Marzanov, N., Stojanovic, S., Simčič, M., Dovč, P., Kompan, D., Dunner, S., Rodellar, C., Martín-Burriel, I., Sánchez, A., Piedrafita, J., Azor, P. J., Delgado, J. V., Martínez-Martínez, A., Molina, A., Rodero, E., Dolf, G., Williams, J. L., Wiener, P., Bruford, M. W., Bray, T. C., Alderson, L., Penedo, M. C. T., Lenstra, J. A., Lenstra, Johannes A., Utrecht University [Utrecht], and European Cattle Genetic Diversity Consortium
- Subjects
breeds ,breed ,[SDV]Life Sciences [q-bio] ,Ecology (disciplines) ,Breeds ,Zoology ,Ethnic origin ,Subspecies ,Q1 ,Crossbreed ,03 medical and health sciences ,symbols.namesake ,QH301 ,aurochs ,auroch ,lcsh:QH301-705.5 ,030304 developmental biology ,Nature and Landscape Conservation ,2. Zero hunger ,0303 health sciences ,Genetic diversity ,biology ,Ecology ,Ecological Modeling ,Linnaean taxonomy ,0402 animal and dairy science ,04 agricultural and veterinary sciences ,Aurochs ,biology.organism_classification ,cattle ,classification ,Classification ,040201 dairy & animal science ,Agricultural and Biological Sciences (miscellaneous) ,Breed ,Ecological Modelling ,lcsh:Biology (General) ,Evolutionary biology ,symbols ,Cattle - Abstract
Chantier qualité GA Liste des auteurs de l'European Cattle Genetic Consortium, classés par pays : Austria: R. Baumung, S. Manatrinon, BOKU University, Vienna; Belgium: G. Mommens, University of Ghent, Merelbeke; Denmark: L.-E. Holm, Aarhus University, Tjele; K.B. Withen, B.V. Pedersen, P. Gravlund, University of Copenhagen, Copenhagen; Estonia: H. Viinalass, Estonian University of Life Sciences, Tartu; Finland: J. Kantanen, I. Tapio, M.H. Li, MTT, Jokioinen; France: K. Moazami-Goudarzi, M. Gautier, Denis Laloë, INRA, Jouy-en-Josas; A. Oulmouden, H. Levéziel, INRA, Limoges; P. Taberlet, Université Joseph Fourier et CNRS, Grenoble; Germany: B. Harlizius, School of Veterinary Medicine, Hannover; H. Simianer, H. Täubert, Georg-August-Universität, Göttingen; G. Erhardt, O. Jann, C. Weimann, E.-M. Prinzenberg, Justus-Liebig Universität, Giessen; I. Medugorac, A. Medugorac, M. Förster, Ludwig-Maximilians Universität, Munich; H.M. Mix, Naturschutz International, Grünheide; C. Looft, E. Kalm, Christian-Albrechts-Universität, Kiel; Ireland: D.G. Bradley, C.J. Edwards, D.E. MacHugh, A.R. Freeman, Trinity College, Dublin; Italy: P. Ajmone Marsan, R. Negrini, Università Cattolica del S. Cuore, Piacenza; M. Longeri, G. Ceriotti, M. Zanotti, Università degli Studi di Milano; D. Marletta, A. Criscione, Universita degli Studi di Catania, Catania; A. Valentini, C. Marchitelli, L. Pariset, M.C. Savarese, Università della Tuscia, Viterbo; F. Pilla, Università del Molise, Campobasso; Latvia: Z. Grislis, Latvia University of Agriculture, Jelgava; Lithuania: I. Miceikienė, Lithuanian Veterinary Academy, Kaunas; Netherlands: I.J. Nijman, Utrecht University; W. van Haeringen, L. van de Goor, Van Haeringen Laboratory, Wageningen; Norway: I. Olsaker, Norwegian School of Veterinary Science, Oslo; Portugal: C. Ginja, L.T.Gama, Instituto Nacional de Recursos Biológicos—INIA, Lisbon University, Lisboa; L.T. Gama, Instituto Nacional de Recursos Biológicos-INIA, I.P., Vale de Santarem; J.C. Mateus, Universidade de Trás-os-Montes e Alto Douro, Vila Real; A. Beja-Pereira, N. Ferrand, Oporto University; Russia: Z. Ivanova, R. Popov, I. Ammosov, Yakutian Research Institute of Agricultural Sciences, Yakutsk, Sakha; T. Kiselyova, All-Russian Research Institute for Farm Animals and Breeding, St. Petersburgh-Pushkin; N. Marzanov, All-Russian Research Institute of Animal Husbandry, Dubrovitsy; Serbia: S. Stojanovic, Ministry of Agriculture and Water Management, Belgrade; Slovenia: M. Simčič, P. Dovč, D.Kompan, University of Ljubljana, Domzale; Spain: S. Dunner, Universidad Complutense de Madrid; C. Rodellar, I. Martín-Burriel, Veterinary Faculty, Zaragoza; A. Sánchez, J. Piedrafita, Universitat Autònoma de Barcelona; P.J. Azor, J.V. Delgado, A. Martínez-Martínez, A. Molina, E. Rodero, University of Córdoba; Switzerland: G. Dolf, University of Berne; UK: J.L. Williams, P. Wiener, Roslin Institute; M.W. Bruford, T.C. Bray, Cardiff University, Cardiff; L. Alderson, Countrywide Livestock Ltd, Shrewsbury; USA: M.C.T. Penedo. University of California, Davis, CA; International audience; Classification of cattle breeds contributes to our understanding of the history of cattle and is essential for an effective conservation of genetic diversity. Here we review the various classifications over the last two centuries and compare the most recent classifications with genetic data. The classifications devised during the 19th to the late 20th century were in line with the Linnaean taxonomy and emphasized cranial or horn morphology. Subsequent classifications were based on coat color, geographic origin or molecular markers. Several theories were developed that linked breed characteristics either to a supposed ancestral aurochs subspecies or to a presumed ethnic origin. Most of the older classifications have now been discarded, but have introduced several Latin terms that are still in use. The most consistent classification was proposed in 1995 by Felius and emphasizes the geographic origin of breeds. This is largely in agreement with the breed clusters indicated by a biochemical and molecular genetic analysis, which reflect either groups of breeds with a common geographic origin or single breeds that have expanded by export and/or crossbreeding. We propose that this information is also relevant for managing the genetic diversity of cattle.
- Published
- 2011
39. A characterization of EM coupling in a fully electric 4-wheel drive vehicle
- Author
-
Iglesias, M., primary, Echeverria, I., additional, Arteche, F., additional, Piedrafita, J., additional, Pradas, A., additional, Arcega, F.J., additional, and De Smet, J., additional
- Published
- 2015
- Full Text
- View/download PDF
40. Monitoring changes in the demographic and genealogical structure of the main Spanish local beef breeds1
- Author
-
Cañas-Álvarez, J. J., primary, Gónzalez-Rodríguez, A., additional, Martín-Collado, D., additional, Avilés, C., additional, Altarriba, J., additional, Baro, J. A., additional, De la Fuente, L. F., additional, Díaz, C., additional, Molina, A., additional, Varona, L., additional, and Piedrafita, J., additional
- Published
- 2014
- Full Text
- View/download PDF
41. Molecular differentiation of European Cattle breeds
- Author
-
Lenstra, J.A., Nijman, I.J., Moazami Goudarzi, K., Laloë, D., Williams, J.L., Wiener, P., Burton, D., Erhardt, G., Jann, O., Weimann, C., Prinzenberg, E.M., Harlizius, B., Looft, C., Dunner, S., Canon, J., Rodellar, C., Zaragoza, P., Martin Burriel, I., Sanchez, A., Piedrafita, J., Ajmone Marsan, P., Negrini, R., Milanesi, E., Valentini, A., Savarese, M.C., Marchitelli, C., Zanotti, M., Ceriotti, G., Pilla, F., Bruzzone, A., Iamartino, D., Bradley, D., Machugh, D.E., Freeman, A.R., Medugorac, I., Medugorac, A., Mix, H., Förster, M., Kantanen, J., Olsaker, I., Holm, L.E., Miceikienė, I., Grislis, Z., Viinalass, H., Danell, B., Eythorsdottir, E., Mommens, G., Van Haeringen, C., Taberlet, P., Luikart, G., Beja Pereira, A., Ferrand, N., Mateus, J.C., Dolf, G., and Felius, M.
- Subjects
Settore AGR/17 - Zootecnica Generale e Miglioramento Genetico - Published
- 2004
42. EMC mapping of a power train for fully electric 4-wheel drive vehicle
- Author
-
Iglesias, M., primary, Echeverria, I., additional, Arteche, F., additional, Piedrafita, J., additional, Pradas, A., additional, and De Clercq, J., additional
- Published
- 2014
- Full Text
- View/download PDF
43. Morfología, demografía y sistema de producción de la vaca de La Albera
- Author
-
Piedrafita, J., Casellas, J., Fina, M., Tarrés, J., and Such, X.
- Subjects
Razas autóctonas ,Ganado bovino ,Recursos genéticos animales ,Producción animal - Abstract
Resumen de la comunicación presentada al III Congreso Ibérico sobre Recursos Genéticos Animales
- Published
- 2002
44. Diversidad genética de la vaca de La Albera estimada mediante microsatélites
- Author
-
Casellas, J., Jiménez, N., Fina, M., Tarrés, J., Sánchez, A., Sánchez, J., and Piedrafita, J.
- Subjects
Razas autóctonas ,Ganado bovino ,Recursos genéticos animales - Abstract
Resumen de la comunicación presentada al III Congreso Ibérico sobre Recursos Genéticos Animales
- Published
- 2002
45. Canalization analysis of birth weight in Bruna dels Pirineus beef cattle1
- Author
-
Fina, M., primary, Ibáñez-Escriche, N., additional, Piedrafita, J., additional, and Casellas, J., additional
- Published
- 2013
- Full Text
- View/download PDF
46. Backfat thickness and longissimus dorsi real-time ultrasound measurements in light lambs1
- Author
-
Esquivelzeta, C., primary, Casellas, J., additional, Fina, M., additional, and Piedrafita, J., additional
- Published
- 2012
- Full Text
- View/download PDF
47. Sources of sire-specific genetic variance for birth and weaning weight in Bruna dels Pirineus beef calves
- Author
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Fina, M., primary, Varona, L., additional, Piedrafita, J., additional, and Casellas, J., additional
- Published
- 2012
- Full Text
- View/download PDF
48. Estructura y relaciones genéticas de la raza bovina Serrana de Teruel con razas explotadas en España
- Author
-
Sanz, A., primary, Rodellar, C., additional, Martín-Burriel, I., additional, Sanz, A., additional, Cons, C., additional, Abril, F., additional, Azor, P.J., additional, Piedrafita, J., additional, Vijil, E., additional, and Zaragoza, P., additional
- Published
- 2011
- Full Text
- View/download PDF
49. Morphological analysis and subpopulation characterization of Ripollesa sheep breed
- Author
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Esquivelzeta, C., primary, Fina, M., additional, Bach, R., additional, Madruga, C., additional, Caja, G., additional, Casellas, J., additional, and Piedrafita, J., additional
- Published
- 2011
- Full Text
- View/download PDF
50. Eating quality of young bulls from three Spanish beef breed-production systems and its relationships with chemical and instrumental meat quality
- Author
-
Serra, X., primary, Guerrero, L., additional, Guàrdia, M.D., additional, Gil, M., additional, Sañudo, C., additional, Panea, B., additional, Campo, M.M., additional, Olleta, J.L., additional, García-Cachán, M.D., additional, Piedrafita, J., additional, and Oliver, M.A., additional
- Published
- 2008
- Full Text
- View/download PDF
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