Little W, Herriman I D, Harrison R D
Vet Rec. 1984 Jun 23;114(25):613-4. doi: 10.1136/vr.114.25.613.
Sixty-five oestruses in 38 cows were confirmed either by using progesterone concentration determined in milk or by conception to a service on the same day. The cows were fed concentrates through variable-time out-of-parlour dispensers and the number of visits made by each cow to the dispensers was automatically recorded daily and a 10-day running mean calculated. A significant increase or decrease in visits was recorded when the number of visits on one day differed from the mean number of visits during the previous 10 days by at least two standard deviations. Ninety-three increases and 40 decreases in visits occurred within +/- 10 days of the 65 confirmed oestruses. There were significantly more (16) than the expected number of increases on the day before oestrus (P less than 0.001) but at no other time. Recording increased visits to out-of-parlour concentrate dispensers may help to identify oestrus in dairy cows.
通过测定牛奶中的孕酮浓度或当天配种受孕情况，确认了38头奶牛的65次发情。奶牛通过可变时间的舍外精料分配器采食精料，每天自动记录每头奶牛到分配器的访问次数，并计算10天的移动平均值。当某一天的访问次数与前10天的平均访问次数相差至少两个标准差时，记录访问次数的显著增加或减少。在65次确认发情的前后±10天内，出现了93次访问次数增加和40次访问次数减少。发情前一天访问次数增加的数量（16次）显著多于预期数量（P<0.001），但在其他时间没有这种情况。记录对舍外精料分配器访问次数的增加可能有助于识别奶牛的发情。
