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jin jiao dui mu zuo niu fan zhi xing neng ying xiang de chu bu yan jiu
Author(s): 
Pages: 14-17
Year: Issue:  2
Journal: China Yak

Keyword:  母牦牛繁殖性能近交;
Abstract: 70头母牦牛繁殖性能的分析结果表明,近交系数的急剧上升,使母牦牛繁殖性能出现明显衰退。当近交系数从0上升到0.125和0.250时。犊牦牛的成活率从93.5%下降到66.7和60.0%;设0世代的近交系数为0,一世代和二世代则为0.108和0.188,0世代和一世代的胎次间隔、犊牦牛成活率、繁活率分别为1.82和2.61年、93.89和81.11%、53.31和34.91%。二世代初产年龄明显晚於一世代。
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