代乳品营养水平对高寒牧区羔羊生长的影响

Effect of milk-replacer nutrition levels on performance of early weaned lambs in alpine pastoral areas

为探讨代乳品营养水平对高寒牧区早期断奶羔羊的饲喂效果,选取30只10日龄的甘肃高山细毛羊羔羊,分为5组,其中对照组(E)羔羊由母羊自由哺乳,并放牧;试验组羔羊10日龄断奶,分为A、B、C、D 4组,代乳品消化能、粗蛋白含量相应为18.5 MJ/kg2、3.0%,20.0 MJ/kg、25.0%,21.5 MJ/kg、27.0%,23.0MJ/kg、29.0%,试验期至90日龄。结果表明,50及70日龄时,对照组羔羊体质量高于试验组;90日龄时,C、D组羔羊体质量显著高于A组(P<0.05),E组高于A、B、C组(P<0.05),而D组与E组差异不显著(P>0.05);E组瘤胃指数显著低于B、C、D组(P<0.05),肾脏指数、肝脏指数显著低于各试验组(P<0.05)。上述结果显示,高寒牧区羔羊10日龄断奶时,采食消化能23.00 MJ/kg、粗蛋白含量29.0%代乳品的体质量与未断奶羔羊无显著差异,生长发育情况优于其他低能低蛋白质的早期断奶羔羊,早期断奶羔羊的胃肠道和肝肾发育程度高于未断奶羔羊。

Four milk-replacer diets（A,B,C and D）,their digestible energy（MJ/kg） and crude protein（%） were 18.5 and 23.0,20.0 and 25.0,21.5 and 27.0,23.0 and 29.0 respectively,were designed to study their feeding effects on early-weaned lambs in alpine pastoral area.Thirty lambs（10 day old） were randomly divided into 5 groups including 4 test groups（A,B,C,D） and 1 control group（E）.The lambs in Group E were raised with ewes milk.The trial period was 90 days.The results showed that the weight and the daily gain of Group E were higher than the test groups while the lamb age was 50 and 70 days.While the age was 90 days,the body weight of Group C and D was significantly higher than Group A（P0.05）;Group E was higher than Group A,B,C（P0.05）,but the difference between group D and E（P0.05） was not significant.Rumen index of Group E was significantly lower than Group B,C and D（P0.05）,meanwhile,the kidney index and liver index were significantly lower than test groups（P0.05）.It could be concluded that the milk-replacer contained 29.0% crude protein and 23.00 MJ/kg digestible energy was proper.