Klassen Katherine E, Pempek Jessica A, Richert Brian T, Horback Kristina M, Stewart Kara R, Marchant Jeremy N, Erasmus Marisa A
Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.
USDA-ARS, Livestock Behavior Research Unit, West Lafayette, IN 47907.
J Anim Sci. 2025 Jan 4;103. doi: 10.1093/jas/skaf196.
In conventional pig production, lactating sows are typically housed in farrowing crates that restrict movement and environmental engagement, raising welfare concerns. Farrowing pens also lack behavioral stimulation for suckling piglets, hindering species-specific behaviors. Environmental enrichment may improve welfare by redirecting behaviors-such as chewing-away from conspecifics in piglets and pen fixtures in sows. However, few studies have explored its effects in farrowing crates, particularly regarding optimal placement within these spatial constraints. This study evaluated the impacts of enrichment strategies on the welfare and performance of 37 lactating sows and their litters from birth through early post-weaning. Sows and litters were divided into three groups: both had access to enrichments (SPE), only piglets had access (PE), and a control group with no enrichments (CON). Point-source objects (PorkyPlays and wooden blocks on rope) were placed 2 d after sows moved into farrowing crates until 2 wk post-weaning. Sow salivary cortisol was collected at four timepoints, and pressure sores were assessed at 8 timepoints from 24 h after crate entry to weaning. Piglet tear stains and skin lesions were recorded throughout the lactation phase. Suckling piglet average daily gain (ADG) was analyzed at days 1 to 7, 7 to 14, and 14 to weaning. In the nursery, salivary cortisol, tear stains, and skin lesions were measured on days 1, 7, and 14 post-weaning, with an additional cortisol sample at day 0 post-weaning. Nursery piglet ADG was analyzed from weaning to day 14 post-weaning. CON sows were more likely to have a pressure sore compared to SPE sows (P = 0.02); PE sows tended to have a higher likelihood of developing a pressure sore than SPE sows (P = 0.097). No treatment effect was found for salivary cortisol of sows or nursery piglets. However, CON piglets had the largest tear stains during lactation (P < 0.001) and nursery (P = 0.001). Treatment affected piglet skin lesions during lactation, with CON piglets having more ear (P < 0.001) and front (P = 0.002) lesions and a higher overall lesion score (P < 0.0001). No treatment effect was found for ADG, piglet crushing, or nursery skin lesions. In conclusion, enrichment strategies in farrowing crates improved piglet skin health and tear stains without affecting performance. Enrichment access for sows tended to reduce pressure sores, suggesting enrichments can enhance welfare in farrowing crate systems.
在传统的养猪生产中,哺乳母猪通常被饲养在产仔栏中,这种栏会限制其活动和与环境的互动,引发了对动物福利的担忧。产仔栏也缺乏对哺乳仔猪的行为刺激,阻碍了它们的物种特异性行为。环境富集可能通过改变行为(如咀嚼行为)来改善福利,使仔猪远离同类个体,母猪远离栏内设施。然而,很少有研究探讨其在产仔栏中的效果,特别是在这些空间限制内的最佳放置方式。本研究评估了富集策略对37头哺乳母猪及其仔猪从出生到断奶后早期的福利和生产性能的影响。母猪和仔猪被分为三组:两组都有富集物可用(SPE)、只有仔猪有富集物可用(PE)以及无富集物的对照组(CON)。点源物体(PorkyPlays和带绳木块)在母猪进入产仔栏2天后放置,直至断奶后2周。在四个时间点采集母猪唾液皮质醇,从进入产仔栏24小时后到断奶期间的8个时间点评估褥疮情况。在整个哺乳期记录仔猪泪痕和皮肤损伤情况。分析1至7日龄、7至14日龄以及14日龄至断奶期间哺乳仔猪的平均日增重(ADG)。在保育期,于断奶后第1、7和14天测量唾液皮质醇、泪痕和皮肤损伤情况,断奶后第0天额外采集一次皮质醇样本。分析断奶后第0天至第14天保育仔猪的ADG。与SPE组母猪相比,CON组母猪发生褥疮的可能性更高(P = 0.02);PE组母猪发生褥疮的可能性比SPE组母猪更高(P = 0.097)。未发现对母猪或保育仔猪唾液皮质醇有治疗效果。然而,CON组仔猪在哺乳期(P < 0.001)和保育期(P = 0.001)的泪痕最大。治疗对哺乳期仔猪皮肤损伤有影响,CON组仔猪耳部(P < 0.001)和前部(P = 0.002)损伤更多,总体损伤评分更高(P < 0.0001)。未发现对ADG、仔猪挤压或保育期皮肤损伤有治疗效果。总之,产仔栏中的富集策略改善了仔猪皮肤健康和泪痕,且不影响生产性能。母猪有富集物可用倾向于减少褥疮,表明富集物可提高产仔栏系统中的动物福利。
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