饲粮锌水平对小尾寒羊生产性能、屠宰性能、肉质及免疫指标的影响

Effects of Dietary Zinc Levels on Growth Performance Carcass Traits Meat Quality and Immune Capability in Small-tail Han Sheep

为探讨生长期小尾寒羊日粮适宜的锌添加水平,选用40只6月龄小尾寒羊,随机分成5组(对照组和试验组Ⅰ-Ⅳ组),对照组饲喂基础日粮(锌含量26mg/kg),Ⅰ-Ⅳ组在基础日粮中分别添加20、50、80、110mg/kg锌,试验周期为45d,测定小尾寒羊生产性能、屠宰性能、肉质和免疫指标。结果表明:与对照组相比,试验Ⅰ、Ⅱ、Ⅲ组平均日增体质量分别显著提高18.18%、27.27%、13.64%;试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组料重比分别显著降低13.73%、15.66%、10.48%、8.43%。试验Ⅰ、Ⅱ组屠宰率分别显著提高6.47%、10.22%;试验Ⅰ、Ⅱ、Ⅲ组滴水损失分别显著降低14.59%、26.69%、19.22%;试验Ⅱ、Ⅲ、Ⅳ组IgG含量分别显著提高31.34%、23.99%、18.63%;试验Ⅱ组IgM含量显著提高36.67%。可见,在本试验条件下,生长期小尾寒羊饲料中锌适宜添加水平为50mg/kg。

In order to study the optimum supply of dietary zinc levels in the growing small-tail Han sheep,forty 6-month-old small-tail Han sheep were randomly assigned to five groups （the control group and the experimental groups ofⅠ-Ⅳ）.The control group were fed with the basal diet（26 mg/kg zinc）.The experimental groups ofⅠ-Ⅳ were fed with the basal diet＋20 mg/kg zinc,basal diet＋50 mg/kg zinc,basal diet＋80 mg/kg zinc and basal diet＋110 mg/kg zinc respectively.The experimental period lasted for 45 days.The growth performance,carcass traits, meat quality and immune capability were observed in the experimental period.The results indicated that the average daily gain（ADG）of group Ⅰ,Ⅱ andⅢ were significantly increased by 18.18%,27.27% and 13.64% than those of the control respectively.The feed∶body weight（F/G） of groupⅠ,Ⅱ,Ⅲ and Ⅳ were significantly decreased by 13.73%,15.66%,10.48% and 8.43%than those of the control respectively.The dressing percentage of group Ⅰ and Ⅱ were significantly increased by 6.47% and 10.22% than those of the control respectively.The drip loss of meat in groupⅠ,Ⅱ and Ⅲ were significantly decrease by 14.59%,26.69% and 19.22% thannbsp;those of the control respectively.The IgG level of groupⅡ,Ⅲ and Ⅳ were significantly increased by 31.34%,23.99% and 18.63% than those of the control respectively.The IgM level of groupⅡ were significantly increased by 3 6.6 7% than those of the control. In conclusion,the appropriate adding supply of dietary zinc levels for the growing small-tail Han sheep was 50 mg/kg at this experimental conditions.