Heinonen K, Rantasalmi K, Alanko M
Acta Vet Scand. 1988;29(2):245-8. doi: 10.1186/BF03548377.
The purpose of this study was to determine the optimal interval between 2 consecutive milk progesterone samples for the detection of cyclicity in dairy cows. Two hundred and thirty-six postpartum periods were monitored with thrice-weekly whole milk progesterone assay. Cyclicity was determined from elevation of the progesterone level. Animals which had started to cycle by 50 or 60 days post partum were included in the study. The last of the 2 samples was taken at 50 or 60 days post partum, respectively. The lowest percentage of false diagnoses (9.0%) in cows which had started to cycle by 50 days post partum was obtained when the samples were taken at 8 days’ interval. In cows which had started to cycle by 60 days post partum the lowest percentage of false diagnoses (1.1%) was obtained when the samples were taken at 10 days’ interval.
本研究的目的是确定连续两次采集乳样检测奶牛发情周期时的最佳间隔时间。通过每周三次检测全乳孕酮对236个产后阶段进行监测。根据孕酮水平升高来确定发情周期。产后50天或60天开始出现发情周期的动物被纳入研究。两次采样中的最后一次分别在产后50天或60天采集。对于产后50天开始出现发情周期的奶牛，当采样间隔为8天时，假诊断率最低（9.0%）。对于产后60天开始出现发情周期的奶牛，当采样间隔为10天时，假诊断率最低（1.1%）。
