Kristula M, Bartholomew R, Galligan D, Uhlinger C
Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Kennett Square 19348.
J Dairy Sci. 1992 Oct;75(10):2713-8. doi: 10.3168/jds.S0022-0302(92)78033-3.
A comparison was made between two different methods of reproductive management in the dairy cow. One protocol administered prostaglandin to open cows weekly; the other administered prostaglandin to open cows with a corpus luteum identified by rectal palpation. Survival analysis was used to analyze the data. Cows receiving weekly doses of prostaglandin had a 30% higher pregnancy rate (number of pregnancies per time) than the cows receiving prostaglandin based on rectal palpation of a corpus luteum. The average number of days to first insemination was shorter in cows given prostaglandin weekly.
对奶牛两种不同繁殖管理方法进行了比较。一种方案是每周给未怀孕母牛注射前列腺素；另一种是给通过直肠触诊确定有黄体的未怀孕母牛注射前列腺素。采用生存分析对数据进行分析。每周接受前列腺素注射的母牛怀孕率（每次怀孕数量）比基于黄体直肠触诊接受前列腺素注射的母牛高30%。每周接受前列腺素注射的母牛首次输精的平均天数更短。
