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ABSTRACT: Morada Nova breed has a low effective herd, and its white variety is in risk of extinction. The selection of individuals based on breed standard without correlation with productive aptitude is predominant today. We believe that the best way to rescue this valuable genetic resource is to describe its productive potential for commercial use. Thus, this study described the meat production potential of Morada Nova lambs through morphological and zoometric data, performance and carcass characteristics. Twenty-four non-castrated male lambs from two genetic groups were used: Morada Nova red (MNR) and crossbreed Morada Nova (red x Morada Nova white-MNF1) distributed in a completely randomized design. Univariate and multivariate analysis were used. The yields of commercial cuts and the physicochemical characteristics and qualitative measurements of the carcass were similar between the genetic groups. Seven of the 28 characteristics of the carcass were greater in MNF1 lambs. The chest height, rump height and anamorphosis index showed to be important variables in the choice of MN lambs with meat production potential. Based on factor and hierarchical cluster analysis, the Morada Nova beef morphometric index (MNBMI) was created. Both of groups have high thoracic development, ability to produce meat, weight gain, feeding efficiency and breathing capacity, infusing greater rusticity and adaptability; however, the application and validation of the developed index showed superiority for meat production in the crossed lambs. Thus, the MNF1 lambs are a sustainable option for sheep production in drylands.

ABSTRACT: This study aimed to use multivariate techniques of principal component analysis and canonical discriminant analysis in a data set from Morada Nova sheep carcass to reduce the dimensions of the original data set, identify variables with the best discriminatory power among the treatments, and quantify the association between biometric and performance traits. The principal components obtained were efficient in reducing the total variation accumulated in 19 original variables correlated to five linear combinations, which explained 80% of the total variation present in the original variables. The first two principal components together accounted for 56.12% of the total variation of the evaluated variables. Eight variables were selected using the stepwise method. The first three canonical variables were significant, explaining 92.25% of the total variation. The first canonical variable showed a canonical correlation coefficient of 0.94, indicating a strong association between biometric traits and animal performance. Slaughter weight and hind width were selected because these variables presented the highest discriminatory power among all treatments, based on standard canonical coefficients.

ABSTRACT: Technical and economic-financial performance of pantaneiro lamb finishing in feedlot (F) and semi-feedlot (SF) was evaluated. When analyzing the profitability, economic efficiency and the price sensitivity, was profit in all the scenarios evaluated. The gross margin (GM) was 69% and 52%, net margin (NM) was 65% and 48% and profitability index (PI) was 39% and 29%, as well as total productivity of factors (TPF) was R$1.53 and R$1.36, respectively, in the systems F and SF. Investment analysis showed that the activity is economically viable, remunerating all production factors and capital invested. Internal return tax was, respectively, 27% and 16% for the in feedlot and semi-feedlot systems.

Technical and economic-financial performance of pantaneiro lamb finishing in feedlot (F) and semi-feedlot (SF) was evaluated. When analyzing the profitability, economic efficiency and the price sensitivity, was profit in all the scenarios evaluated. The gross margin (GM) was 69% and 52%, net margin (NM) was 65% and 48% and profitability index (PI) was 39% and 29%, as well as total productivity of factors (TPF) was R$1.53 and R$1.36, respectively, in the systems F and SF. Investment analysis showed that the activity is economically viable, remunerating all production factors and capital invested. Internal return tax was, respectively, 27% and 16% for the in feedlot and semi-feedlot systems. Key words: production simulation; performance; sheep production; pantaneiro lamb, production systems. [ABSTRACT FROM AUTHOR]

Foram analisados quatro grupos de ovinos machos da raça Santa Inês nascidos em quatro estações do ano, no Distrito Federal, a fim de observar as idades e o peso corporal em que estes atingiram a puberdade. A partir dos cortes histológicos dos testículos, foram analisados parâmetros celulares e mensurações dos túbulos seminíferos. O efeito da data de nascimento sobre os parâmetros avaliados foi significativo (PFour groups of Santa Inês male sheep born in four seasons in the Distrito Federal were analyzed to evaluate the age and body weight at puberty, at which point were castrated. Histological measurements were carried out on the testicles to evaluate cellular parameters and size measurements of the seminiferous tubules. The effect of the group on cellular parameters was significant (P

O presente trabalho objetiva relatar os principais tipos de distocias em ovelhas, no Agreste e Sertão de Pernambuco, e avaliar alguns fatores relacionados com sua ocorrência, bem como determinar a eficiência dos tratamentos utilizados. A maior incidência de partos distócicos ocorreu na estação chuvosa, com 61,7% dos casos. Os resultados mostraram predominância de distocias de origem materna (71,6%) sobre a fetal (29,4%), com maior incidência em ovelhas primíparas da raça Santa Inês, com gestações gemelares. A principal distocia materna foi a ausência ou dilatação cervical insuficiente, e fetal, a má disposição na apresentação anterior. A taxa de sobrevivência das mães correspondeu a 100 e 88,6%, enquanto das crias alcançou 41,2 e 46,7%, após manobra obstétrica e cesariana, respectivamente, com predominância de cordeiros inviáveis em ambos os procedimentos. As manobras obstétricas e a cesariana pelo flanco esquerdo permanecem opções seguras para o tratamento de distocias em ovelhas, sendo ainda importantes coadjuvantes, minimizando o impacto econômico causado por essa enfermidade em Pernambuco.The aim of the present study was to report the main dystocia causes in sheep in Agreste and semiarid region of Pernambuco and to evaluate some factors related to their occurrence, besides of determining the efficiency of the treatment choices. The higher incidence of dystocia occurred in rainy season corresponding to 61.7%. Results showed a major predominance of maternal dystocia (71.6%) over fetal dystocia (29.4%) with higher incidence in primiparous and gemelar pregnant Santa Inês ewes. The main maternal dystocia was ringwomb while fetal dystocia was maldisposition in anterior presentation. Maternal survival rate correspond to 100% and 88.6%, while lambs achieved 41.2% and 46.7% after obstetrical maneuver and caesarean section, respectively, with predominance of unviable lambs in both procedures. Obstetrical maneuver and left flank cesarean section remain as safe options for the treatment of sheep dystocia and are also important coadjutants in minimizing the economical impact that this disease causes in Pernambuco.

Four groups of Santa Inês male sheep born in four seasons in the Distrito Federal were analyzed to evaluate the age and body weight at puberty, at which point were castrated. Histological measurements were carried out on the testicles to evaluate cellular parameters and size measurement of the seminiferous tubules. The effect of the group on cellular parameters was significant (P<0.01). Animals born in the dry season were more precocious than the others, but showed the worst histological profile of the testis. The histological traits of the testis of the Santa Inês rams were influenced by the season. The end of the rainy season was shown to the best season for births of sheep in the Central region of Brazil, with histological testicular traits at puberty being superior to the other groups. [ABSTRACT FROM AUTHOR]

The aim of the present study was to report the main dystocia causes in sheep in Agreste and semiarid region of Pernambuco and to evaluate some factors related to their occurrence, besides of determining the efficiency of the treatment choices. The higher incidence of dystocia occurred in rainy season corresponding to 61.7%. Results showed a major predominance of maternal dystocia (71.6%) over fetal dystocia (29.4%) with higher incidence in primiparous and gemelar pregnant Santa Inês ewes. The main maternal dystocia was ringwomb while fetal dystocia was maldisposition in anterior presentation. Maternal survival rate correspond to 100% and 88.6%, while lambs achieved 41.2% and 46.7% after obstetrical maneuver and caesarean section, respectively, with predominance of unviable lambs in both procedures. Obstetrical maneuver and left flank cesarean section remain as safe options for the treatment of sheep dystocia and are also important coadjutants in minimizing the economical impact that this disease causes in Pernambuco. [ABSTRACT FROM AUTHOR]