Watson E D, Jones P C, Saunders R W
Ministry of Agriculture, Fisheries and Food Cattle Breeding Centre, Shinfield, Reading, Berkshire.
Vet Rec. 1987 Sep 12;121(11):256-8. doi: 10.1136/vr.121.11.256.
The results of 7569 inseminations performed on 6007 cows in 94 dairy herds were used to investigate the relative importance of time of insemination, bull and inseminator on calving rates in dairy cows. Although the time of insemination in relation to the first observation of oestrus was shown to have some effect, the effect was minimal during the first 24 hours. The maximum difference in expected calving rates between cows served with semen from groups of bulls with a history of either low or high fertility was 20 per cent, and the maximum difference in expected calving rate between cows inseminated by groups of inseminators who had consistently achieved either low or high fertility was 13 per cent.
对94个奶牛群的6007头奶牛进行了7569次授精，利用这些结果研究了授精时间、公牛和输精员对奶牛产犊率的相对重要性。尽管授精时间与首次观察到发情的关系显示出有一定影响，但在最初24小时内这种影响很小。使用来自具有低生育力或高生育力历史的公牛组精液授精的奶牛，预期产犊率的最大差异为20%；由一贯实现低生育力或高生育力的输精员组进行授精的奶牛，预期产犊率的最大差异为13%。
