北方枯草期精料不同饲喂量对安格斯牛产后繁殖性能的影响研究

Study on the effects of different feed amounts on the reproductive performance of Angus cattle during the withering period in North China

为探究北方枯草期不同补饲量对安格斯牛产后繁殖性能的影响,试验将60头安格斯牛分为4组,试验1组为放牧+1.0 kg补饲料,试验2组为放牧+1.5 kg补饲料,试验3组为放牧+2.0 kg补饲料,试验4组为放牧+2.5 kg补饲料,测定母牛难产、胎衣不下、恶露不净、子宫内膜炎数及产后第一次发情情况、第一次配种头数、情期受胎率、成活率。结果表明:试验3组母牛难产、胎衣不下、恶露不净、子宫内膜炎均未发生,且第一次发情时间缩短,情期受胎率和犊牛成活率均为最优。说明北方枯草期放牧+2.0 kg补饲料对安格斯母牛繁殖性能效果最优。

The aim of the experiment was to investigate the effect of different supplement amount of forage on the reproductive performance of Angus cattle after parturition.The 60 Angus cattle were divided into 4 groups in this experiment.The group 1,2,3 and 4 were fed with 1.0,1,5,2.0,2.5 kg concentrate respectively on the basis of grazing.The dystocia,etal rest,unclean lochia,endometritis,first estrus after delivery,and number of first breeding heads,estrus conception rate,survival rate were measured.The results showed that the dystocia,retained placenta,lochia and endometritis did not occur in group 3,and the first estrus time of group 3 was shortened,and the conception rate and the survival rate of calves were the highest.It shows that grazing in the dead grass stage in North China+2.0 kg feed supplement has the best effect on the reproductive performance of Angus cows.