【摘要】 为了解湟源县牛品种改良效果,掌握良种奶牛的饲养量,从2004年我们根据各牛改点的配种记录,深入农户,对牛受胎、产犊情况进行了调查,结果表明:良种母畜比例提高了35%,良种畜存栏达到22 389头。更多还原

【Abstract】 To understand the effect of cattle improvement and population size of dairy cows in Huangyuan County,artificial insemination record,conception rate and calving were investigated family by family.It was found that fine breed dairy cows reached 22.389 thousands,which covered 35% of all cows.更多还原