环境富集和饲养密度对绵羊福利的影响

试验主要研究环境富集和饲养密度对绵羊生产性能、血清指标、屠宰性能的影响。选用健康的小尾寒羊24只，分为A、B、C 3组，每组8只，A 组为高集约化模式，B组为高集约化模式+运动场模式，C组为环境富集模式。结果表明，各组绵羊的末重、平均日增重、平均日采食量、饲料转化率差异不显著，环境富集和适宜的饲养密度有提高绵羊生产性能的趋势。环境富集和适宜的饲养密度可以极显著改善前膝清洁度指数（P<0.01），显著改善后膝、后臀的清洁度指数（P<0.05）；环境富集和适宜的饲养密度能显著降低第37天血清皮质醇浓度（P<0.05）；各组肉品质差异不显著（P>0.05）；宰杀后各组pH45 min和pHult的差异不显著（P>0.05）。因此，环境富集和饲养密度能在一定程度上提高绵羊福利。

Effects of Environmental Enrichment and Stocking Density on Sheep Welfare

A study was conducted to investigate effects of environmental enrichment and stocking density on performance，serum cortisol concentrations, meat quality and sarcous pH of sheep, twenty four small tail han sheep were assigned to three treatments: ①confinement in a pen (A); ②confinement in a pen with a yard (B); ③confinement in a pen with a yard and environmental enrichment as well (C).The results showed that environmental enrichment and stocking density had no significant effects on growth performances(P>0.05), although they tended to improve it. A highly significant difference in surface cleanness existed among groups (P<0.01) and at Day 37, environmental enrichment and stocking density significantly significantly decreased serum cortisol concentration (P<0.05). Environmental enrichment and high stocking density did not affect meat yield and pH 45 min, pHult of sarcous (P>0.05). The results indicated that environmental enrichment and stocking density can improve sheep welfare.