夏南横交母牛繁殖性能调查
china Cattle Science（2008）
Abstract
通过对581头1 240胎次夏南横交母牛繁殖性能的调查显示,夏南横交母牛的初情时间平均为472.3 d,发情周期为19.6 d,初配时间为493.2 d,妊娠期为285.9 d,产后初配时间为60.3 d,难产率为1.05%,2.5岁前产头犊可达94.0%,2~10.5岁产犊率为86.0%。
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Key words
Reproductive Performance,Investigate,Xianan Crossbred Cow
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