Oltenacu E A, Foote R H, Bean B
J Dairy Sci. 1980 Aug;63(8):1351-5. doi: 10.3168/jds.S0022-0302(80)83087-6.
Two semen culling programs designed to improve fertility of semen used in an artificial insemination program were compared. First inseminations and return service data on cows inseminated with semen from 21 Holstein bulls during 1 yr were studied. The culling of less fertile ejaculates within bulls, based on any available semen quality test or combination of tests, would bring about less than a 1% increase in nonreturn rate if 40 to 50% of ejaculates were called. If all semen from the 19% low fertility bulls were culled, this would entail culling 22% of the semen used to inseminate the population and would achieve an improvement of 1% in overall fertility. This could be done with no loss in predicted difference for milk yield of bulls used. Culling of bulls is a functionally simpler and less expensive program than is testing and culling ejaculates within bulls, but this requires that fertility of bulls be known and that it will not change substantially from predicted.
对旨在提高人工授精项目中所使用精液受精率的两种精液筛选方案进行了比较。研究了在1年期间用来自21头荷斯坦公牛的精液对母牛进行首次授精及返情服务的数据。若根据任何可用的精液质量检测或检测组合，在公牛体内筛选出受精率较低的射精量，那么当40%至50%的射精量被判定为不合格时，未返情率的提高幅度将不到1%。如果将19%低受精率公牛的所有精液都筛选掉，这将意味着要筛选掉用于给牛群授精的22%的精液，并且总体受精率将提高1%。这样做不会导致所用公牛产奶量预测差异的损失。与在公牛体内检测和筛选射精量相比，淘汰公牛在功能上更简单且成本更低，但这要求了解公牛的受精率，并且其受精率不会与预测值有太大变化。
