奶牛不孕症的发病率。
Incidence of infertility in dairy cows.
作者信息
Roine K, Saloniemi H
出版信息
Acta Vet Scand. 1978;19(3):354-67. doi: 10.1186/BF03547605.
The incidence of anoestrus, suboestrus, delayed ovulation, cystic ovaries, repeat breeder cows, endometritis and other forms of infertility was studied in 283 herds over a period of eight years (2,304 cases). The total incidence of infertility (0.111 cases per cow per year) varied significantly from year to year. The peak of the seasonal variation occurred in December-April and did not correspond with the seasonal variation in calving. Both the size of herd and the type of housing affected the incidence of infertility, but the differences were great in respect of the various diagnoses. The incidence of ketosis by herd correlated significantly with the incidence of infertility by herd.
在八年时间里，对283个牛群中的2304例病例进行了研究，以了解母牛发情停止、发情不足、排卵延迟、卵巢囊肿、屡配不孕母牛、子宫内膜炎及其他不孕形式的发生率。不孕的总发生率（每年每头母牛0.111例）随年份有显著变化。季节性变化的高峰出现在12月至4月，与产犊的季节性变化不相符。牛群规模和牛舍类型均影响不孕发生率，但就各种诊断而言，差异很大。牛群中酮病的发生率与牛群中不孕的发生率显著相关。
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