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Copyright of Canadian Journal of Animal Science is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Site-segregated early weaning (SSEW) refers to the practice of weaning pigs from the sow at an early age and placing them in a nursery that is physically isolated from the breeding herd. An experiment involving 369 pigs was conducted at the Prairie Swine Center to investigate the impact of SSEW on pig performance when the herd of origin has a high health status and when housing and management conditions are kept as similar as possible across weaning regime. Three treatments were compared: weaning at 21 [+ or -] 3 d and keeping the pigs on-site in an all-in-all-out nursery room (Control), weaning at 12 [+ or -] 2 d of age and keeping the pigs on-site in a separate but identical all-in-all-out nursery room (OSEW), or weaning at 12 [+ or -] 2 d of age and moving the pigs off-site to an all-in-all-out nursery room located 16 km from the Center (SSEW). Ventilation, feed, penning, feeders, and drinkers were kept as similar as possible for all treatments. Off-site weaning improved 56-d body weight (P [is less than] .05) by 12.5 and 8.3% compared with OSEW and Control, respectively. The improvement appeared to be the result of improvements primarily in feed intake but also due to enhanced efficiency of nutrient utilization. This experiment confirms that SSEW results in significant improvements in 56-d weights, even when the herd of origin has a relatively high health status. Key Words: Nursery, Segregated Early Weaning, Weaning Age

The article focuses on a study related to the examination of meat quality and health of pigs which is transported for two hours using two vehicle types during two seasons of the year. According to the study, type of vehicle, animal location in the truck and the seasonal variation affect the health of pigs during transportation. It further states that researchers used pot-belly trailer (PB) and a hydraulic double-decked truck (DD) in order to assess the affect of vehicle on pork quality.

Copyright of Canadian Journal of Animal Science is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Canadian Journal of Animal Science is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Climatic conditions in Canada show extreme seasonal variation, and thermal conditions during transport are known to contribute to mortality during transport. However, little information has been published on transport conditions in Canada. In this study, temperature and relative humidity were monitored on commercial livestock trucks transporting pigs to market in eastern and western Canada. In the western trials, pigs traveled for 8 h in a dual-purpose pot-belly (PB) trailer, and in the eastern trials pigs were transported for 2 h in either a PB trailer or a double-deck (DD) truck. In the west, three trials were done in winter and five in summer; in the east, six trials were done in both summer and winter. Delta temperature (T) and delta humidity ratio (HR) were calculated versus ambient conditions during transport for each truck compartment. Mixed model analyses of compartment conditions (delta T and delta HR) within each truck showed that significant variation existed between compartments in both the PB trailer and the DD truck (p < 0.0001). For all vehicles, delta T and delta HR were generally higher (p < 0.05) in lower-front compartments and lower (p < 0.05) in upper-rear compartments in both summer and winter. The results indicate that transport conditions may be improved by increasing ventilation to targeted compartments in summer, or by a combination of insulation and ventilation in winter. Considering the impact of thermal conditions during transport on pig welfare and mortality, further investigation of truck conditions and ways of ameliorating them is warranted. [ABSTRACT FROM AUTHOR]

With the current shift in the industry toward housing pigs in groups of 100 to 1,000 per pen have come questions as to whether pigs can perform as well in large groups as they do in small and whether large groups of pigs can use the space provided more efficiently. This study examined effects of small (18 pigs) vs. large (108 pigs) group sizes provided 0.52 m²/ pig (crowded) or 0.78 m²/pig (uncrowded) of space on production, health, behavior, and physiological variables. Eight 7-to 8-wk-long blocks, each involving 288 pigs, were completed. The average BW at the beginning of the study was 37.4 ± 0.26 kg. Overall, ADG was 1.032 kg/d and 1.077 (±0.015) kg/d for crowded and uncrowded pigs, respectively (P = 0.018). Differences between the space allowance treatments were most evident during the final week of study. Overall G:F was also reduced (P = 0.002) in the crowded treatment. Pigs in the crowded groups spent less (P = 0.003) time eating over the 8-wk study than did pigs in noncrowded groups, but ADFI did not differ (P = 0.34) between treatments. Overall, ADG of large-group pigs was 1.035 kg/d, whereas small group pigs gained 1.073 kg/d (±0.015; P = 0.039). Average daily gain differences between the group sizes were most evident during the first 2 wk of the study. Over the entire study, G:F also differed, with large groups being less efficient (P = 0.005) than small groups. Although large-group pigs had poorer scores for lameness (P = 0.012) and leg scores (P = 0.02) throughout the 8-wk period, morbidity levels did not differ (P = 0.32) between the group sizes. Minimal changes in postural behavior and feeding patterns were noted in large groups. An interaction (P = 0.04) of group size and space allowance for lameness indicated that pigs housed in large groups at restricted space allowances were more susceptible to lameness. Although some behavioral variables, such as lying postures, suggest that pigs in large groups were able to use space more efficiently, overall productivity and health variables indicate that pigs in large and small groups were similarly affected by the crowding imposed in this study. Broken-line analysis of ADG indicated no difference in the response to crowding by pigs in large and small groups. Little support was found for reducing space allowances for pigs in large groups. [ABSTRACT FROM AUTHOR]

The incidence of belly nosing-related behaviors was studied in 480 piglets weaned at 14 d and provided with environmental enrichment during preweaning, postweaning, or both. Pen enrichment was achieved by providing a foam rubber mat on the pen wall (nose), rubber nipples (suck), a Bite-Rite Tail Chew (bite), a soil-filled tray (root), or no enrichment (control). Instantaneous scan sampling observations, at 5-min intervals, were conducted for 8 h (i.e., 96 scans/observation day) at 3, 10, 19, 26, and 33 d. Observations during the preweaning phase were made to determine the number of piglets lying, standing, nursing, and interacting with environmental enrichment. During the postweaning phase, observations were made to determine the number of piglets belly nosing, belly sucking, other nosing and sucking (other), biting, eating, drinking, and interacting with enrichment. The time-course for belly nosing was confirmed, with the behavior rising by 19 d, peaking by 26 d, and decreasing by 33 d (P < 0.001). Only nosing enrichment was found to reduce the incidence of belly-nosing behavior (3.8%) compared with controls (6.6%; P < 0.001). Pigs provided root enrichment spent more time manipulating their enrichment devices (30.2%) compared with all other enrichment groups (P < 0.001). Providing enrichment relevant to a particular behavioral vice as it commences, or shortly afterward, may have the greatest effect on reducing the incidence of that vice during the nursery period. [ABSTRACT FROM AUTHOR]

Three experiments were conducted to assess water intake, water wastage, and a means to decrease water wastage by growing-finishing pigs from nipple drinkers. In Exp. 1,48 pigs were studied during two periods (average BW = 53 and 72 kg for Period 1 and 2, respectively). Water disappearance and wastage were determined for 4 d, while nipple drinkers were set at 50 mm above the shoulder height of the smallest pig in the pen (recommended heights), with flow rates at 700 mL/min during Period 1, and 1,000 mL/min during Period 2. Water intake rate was assessed at two nipple flow rates, approximately 650 and 1,300 mL/min during the Period 1, and 1,000 and 2,000 mL/min during the Period 2. The average water intake was 4.01 and 5.38 ± 0.19 L·pig-1·d-1 during Periods 1 and 2, respectively (P < 0.01). Water wastage as a percentage of water disappearance was similar between the two periods (25.8 and 27.0 ± 1.9% for Periods 1 and 2, respectively). Water intake rate was 467 and 795 mL/min (±34.2; P < 0.01) during Period 1, and 722 and 1,422 mL/min (±80.0; P < 0.01) during Period 2, at the lower and higher flow rates, respectively. In Exp. 2, 32 pigs were used in a 2 x 2 factorial design to determine effects of nipple heights (recommended vs. unadjusted = 330 mm) and flow rates (500 vs. 1,000 mL/min) on water intake and wastage. Water wastage was increased (P < 0.01) on the unadjusted vs. recommended nipple height, and the higher flow rate also resulted in greater wastage (P = 0.03) compared with the lower rate. In Exp. 3, water disappearance and manure output in 16 pens of 18 pigs per pen were monitored for 12 wk (average initial BW = 32 kg) using four drinker treatments (bowl drinker, nipple drinker at recommended heights, an unadjusted nipple set at 480 mm, and high nipple drinker height of 730 mm with a step underneath). For pigs on the high nipple drinker, the average water disappearance and manure output did not differ from those of the pigs on the recommended nipple heights and bowl drinker, but these measurements were 15 and 12% lower, respectively, than for the pigs on the low nipple drinker. The results indicate that growing-finishing pigs can maintain adequate water intake from a variety of drinker types and management. Water wastage can be controlled through drinker management. [ABSTRACT FROM AUTHOR]

The objective of this study was to assess the effects of the season, travel duration and trailer compartment location on blood creatine-kinase (CK), lactate and cortisol concentrations in 384 pigs and assess their relationships with trailer temperature, heart rate and gastrointestinal tract temperature (GTT), behavior, carcass damage scores and meat quality. Blood CK was greater in pigs transported in summer ( p = 0.02), after 18 h transportation ( p < 0.001) and in pigs located in C4, C5 and C10 ( p = 0.002). In winter, the concentration of blood lactate was higher ( p = 0.04) in pigs transported for 6 h in C5. Pigs located in C10 showed higher ( p = 0.01) concentration of cortisol than those transported for 18h in C4 in summer. The highest correlations were between blood cortisol and GTT ( r = 0.53; p < 0.001), and between blood CK and GTT ( r = 0.41; p < 0.001), truck temperature ( r = 0.42; p < 0.001), and pH u in the longissimus muscle ( r = 0.41; p < 0.001). In conclusion, although increased blood cortisol and CK levels appear to indicate a physical stress condition in transported pigs, the weak to moderate correlations with environmental and other animal welfare indicators suggest that blood stress parameters can only be used as a complementary measurement in the assessment of the pigs' response to transport stress.

Heat stress is a problem that negatively affects animal welfare, health, and the productive efficiency of pigs. The objective of the study was to evaluate the effect of the trailer microclimate on some physiological, behavioral, and meat pH of fattening pigs during short‐duration journeys. Eight journeys (n = 216 pigs) of short duration (51.6 km and 1.5 h), originating from the same farm, were evaluated with a stocking density of 0.57 (±0.04) m2/100 kg (mean BW: 116.1 ± 7.52 kg). The thermal profile of the load (THI) was recorded in the four compartments of the truck. Upon arrival at the slaughterhouse, unloading was evaluated, and the percentage of nonambulatory pigs, mortality, and body temperature were recorded. Blood samples were obtained during exsanguination and the pH45 was measured. Overall, THI values recorded in all four compartments were below the threshold considered conducive to heat stress in pigs (23.9°C and THI ≤ 74). Serum concentrations of cortisol and the neutrophil/lymphocyte (N/L) ratio were above concentrations considered normal for the species (p < 0.05) and no significant differences were observed in average meat pH45 values according to the truck compartment (p > 0.05). The planning of transport in the morning hours and the consideration of the thermal environment of the truck is essential to reduce heat stress, economic losses, and negative effects on meat quality. [ABSTRACT FROM AUTHOR]

According to the modern perspective on evaluating animal welfare, it is important to consider both negative and positive experiences. This study investigated the impact of group composition and environmental enrichments on the behaviours of free-ranging pigs, focusing on anxiety-related behaviours, aggression, affiliation, post-conflict affiliation, excavation, and non-invasive exploration activities. Data were collected on three different groups (allfemale: N=10; all-male: N=13; mixed-sex: N=12) of free-ranging pigs raised in a natural woodland habitat at the ethical farm "Parva Domus" (Turin, Italy). To evaluate the impact of environmental enrichment, further data collection was carried out on the mixed-sex group under three different enrichment conditions (absence; dry leaves; straw) provided in a rotational scheme. Group composition did not affect levels of anxiety-related behaviours, aggression, and non-invasive exploration. However, it did impact other social aspects (affiliation: One-way ANOVA: p=0.003; post-conflict affiliation: Kruskal-Wallis: p=0.005). In particular, the mixed-sex and the all-male groups showed higher levels of affiliation than the all-female group and the mixed-sex group showed higher levels of post-conflict affiliation than the all-male group. Moreover, we found differences in excavation behaviour levels (Kruskal-Wallis: p=0.001), with higher levels of excavation behaviour in the mixed-sex group compared to the allfemale group. Regarding the impact of enrichments, we found differences in levels of anxiety-related behaviours (One-way ANOVA: p = 0.046), affiliation (One-way ANOVA: p = 0.006), excavation (One-way ANOVA: p<0.001), and non-invasive exploration activities (One-way ANOVA: p<0.001). In enrichment conditions with straw, we found a significant decrease in anxiety-related, affiliation, and excavation behaviours levels, and a significant increase in noninvasive exploration behaviours. A trend with lower levels of aggression was observed in straw enrichment condition compared to the absence of enrichment, although the difference was not significant. Moreover, there were no differences in post-conflict affiliation frequencies. Our findings suggest that forming mixed-sex groups and providing environmental enrichments such as the straw could be suitable solutions to effectively reduce invasive excavation behaviours without preventing pigs from expressing their natural behavioural repertoire, thus maintaining high standards of animal welfare. This study highlights behavioural aspects to be considered in extensive farming, confirming the importance of ethology as a tool for assessing pig welfare. [ABSTRACT FROM AUTHOR]

Tail biting is a multifactorial behavior that causes welfare and economic challenges in swine production. As of 2024, research exploring the influence of pig social structure on the development of tail biting is limited. The objective of this study was to explore whether social structures of pigs from different litter origins can impact tail biting and, ultimately, tail damage. Pigs (n = 96) were grouped (eight pigs/pen) based on their litter origin: non-littermates (NLM), half-littermates, and littermates (LM). Tail injury scores were assessed twice weekly from 10 to 24 weeks of age, with a maximal tail injury score (MTS) over the study period being used to evaluate victimization by tail biting. Pig behavior was video-recorded at 15, 19, and 23 weeks of age. Association networks based on lying behavior and tail biting interaction networks were evaluated at penand pig-levels using social network analysis. Pigs in LM pens experienced higher median MTS compared to pigs in NLM pens (Median = 1.5; Interquartile range = 1-2; p = 0.009). Within association networks, NLM pens had lower degree centralization measures than other pens at both 15 (Estimated marginal mean [EMM] = 0.07; 95% CI = 0.02-0.12; p = 0.003) and 23 weeks (EMM = 0.09; 95% CI = 0.04-0.14; p = 0.01) and pigs in NLM pens had higher weighted degree centrality than those in other pens (EMM = 1.00; 95% CI = 0.90-1.11; p = 0.002), suggesting pigs in NLM pens had more uniform, stronger, and more connections with their pen-mates. In tail biting networks, increased weighted in-degree centrality was associated with increased odds of pigs receiving a more severe MTS (OR = 1.56; 95% CI = 1.08-2.27; p = 0.02). Pigs with increased weighted out-degree centrality tended to have increased odds of receiving a more severe MTS (OR = 1.19; 95% CI = 0.97-1.48; p = 0.09). These preliminary data suggest a potential relationship between social structures and tail biting in growing-finishing pigs. [ABSTRACT FROM AUTHOR]

Hygienically safe drinking water is essential for the health, well-being, and efficient production of livestock. In contrast to drinking water for human consumption, there are guidelines but no legal limits for drinking water for animals. Risk factors due to hygienically relevant microorganisms or chemical compounds in drinking water are known from literature, but there is little information on the quality of drinking water for livestock in Germany. To gain an overview of the quality of drinking water, data from samples collected from pig and poultry farms in Northwest Germany over a 10-year period were analyzed retrospectively. Data consisted of 326 samples analyzed chemically, and 519 samples analyzed microbiologically. Of these, 80 water samples were analyzed for both chemical and microbial contaminants. There was no correlation between samples exceeding chemical and microbial guideline levels. The number of samples exceeding the chemical guideline values (58.0%) was higher than the number of samples exceeding the microbiological guideline values (47.4%). This long-term study illustrated the potential risk to pigs and poultry from drinking water and highlights the need for effective hygiene measures to prevent the transmission of microorganisms and chemicals residues through water to maintain animal health and safe food products. [ABSTRACT FROM AUTHOR]

A total of 2,145 pigs were transported for 8 h in summer (six trips) and winter (five trips) using a pot-belly trailer accommodating pigs in four locations (upper deck or UD, bottom-nose or BN, middle deck or MD and bottom deck or BD). Heart rate of pigs during loading and transportation and lactate and creatine kinase (CK) concentrations in exsanguination blood were measured. Meat quality was evaluated in the Longissimus thoracis (LT), Semimembranosus (SM) and Adductor (AD) muscles. During summer, pigs loaded in the UD and MD had higher (P < 0.05) heart rate at loading compared to those located in the BD and BN. Blood lactate and CK concentrations were higher (P < 0.001) in winter than in summer. Lactate concentration was higher (P = 0.01) in the blood of pigs transported in the BN. Pigs transported in the BN had higher pHu values in the LT, SM and AD muscles (P = 0.02, P < 0.001 and P = 0.002, respectively) and lower (P = 0.002) drip loss values in the SM muscle. This study confirms that some locations within the PB trailer have a negative impact on the welfare of pigs at loading and during transport with more pronounced effects in the winter due to the additive effect of cold stress.