Appleyard W T, Cook B
Vet Rec. 1976 Sep 25;99(13):253-6. doi: 10.1136/vr.99.13.253.
A survey attempted to determine the extent to which cows are being inseminated when not in oestrus. The method used to check the farmers' diagnoses of oestrus was based on peripheral plasma progesterone concentrations analysed by radioimmunoassay. Of 141 cows examined in this way, a total of 30 (21-28 per cent) showed abnormalities of the progesterone levels. The fertility within this group was very poor with only two of the cows being known to have conceived to the service in question.
一项调查试图确定母牛在非发情期进行人工授精的程度。用于检查农民对发情诊断的方法是基于通过放射免疫分析法分析外周血浆孕酮浓度。通过这种方式检查的141头母牛中，共有30头（21%-28%）的孕酮水平出现异常。该组的生育能力非常差，已知只有两头母牛在相关配种中受孕。
