摘要
辖曼种羊场437头次2—25岁母牦牛的测定结果表明,母牦牛一般在3—4岁初产,占81.0%,少数(占3.2%)发育良好的母牦牛在2岁初产,5岁后初产的只有15.9%。5—13岁时,母牦牛的产犊率,犊牦牛成活率和繁活率高,平均为63.9%,91.9%和58.7%;2岁、3岁、4岁组的成活率和繁活率分别为50.0%和1.6%、68.9%和17.5%、85.7%和47.6%;17岁后一般不再具有繁殖能力,但少数(5头)在20岁后还产犊,然而成活率很低,只有63.6%。
Reproductive performance test of female yak from 2 to 25 years in Xiaman Farm showed that age at first catver was generally 3 or 4 years, which constituted 81.0% and a few of well developed female yak (3.2%)got first calver in 2 years. Reproductive performance of female yak in age from 5 to 13 years was better, calving rate, survival rate of calver were 63.9 and 91.9%. The most of female yaks was sterile after 17 years and just a few of them cavered after 20 years, but survival rate of the calver was only 63.6%.
出处
《中国牦牛》
1994年第2期23-25,54,共4页
基金
国家"八五"科技攻关项目85-11-03-03研究内容
