Fordham D P, McCarthy T T, Rowlinson P
Faculty of Agriculture, University of Newcastle, Newcastle upon Tyne, UK.
Vet Res Commun. 1987;11(4):381-91. doi: 10.1007/BF00346196.
Vaginal and milk temperatures were measured at each milking in 15 post-partum Friesian cows showing recurrent oestrous cycles for a total of 33 oestruses. A significant increase (P less than 0.001) in both vaginal and milk temperature of 0.29 +/- 0.05 degrees C was shown between the milking prior to oestrus and the milking when oestrus occurred. Cows were divided into 3 groups: showing either a definite temperature rise (27% of cases), a limited temperature rise (60%) or no temperature change (13%) associated with oestrus. Various methods of analysis were investigated to determine the usefulness of the milk temperature data for oestrus prediction. The optimum compromise of high oestrus detection rate (73.3 +/- 16%) and lowest percentage of false positives (10.8 +/- 3.0%) was based on a temperature rise on the day of oestrus of greater than or equal to 0.2 degrees C over the corresponding mean temperature of the preceding three days. These rates suggest the measurement of milk temperature is less useful for oestrus prediction than some earlier reports have indicated.
在15头产后处于发情周期的弗里斯兰奶牛身上，每次挤奶时测量其阴道温度和乳温，共记录了33次发情。发情前一次挤奶到发情时挤奶期间，阴道温度和乳温均显著升高（P<0.001），升高幅度为0.29±0.05℃。奶牛被分为3组：发情时温度有明显升高的（占病例的27%）、温度有限升高的（60%）或无温度变化的（13%）。研究了各种分析方法，以确定乳温数据用于发情预测的有效性。发情检测率高（73.3±16%）且假阳性率最低（10.8±3.0%）的最佳折衷方案是，发情当天的温度比前三天相应平均温度升高≥0.2℃。这些比率表明，与一些早期报告指出的情况相比，乳温测量用于发情预测的作用较小。
