Prepartum change in ventral tail base surface temperature in beef cattle: comparison with vaginal temperature and behavior indices, and effect of ambient temperature
Prepartum change in ventral tail base surface temperature in beef cattle: comparison with vaginal temperature and behavior indices, and effect of ambient temperature
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DOI：
10.1262/jrd.2019-087
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发表时间：
2019-12-01
影响因子：
1.8
通讯作者：
Sakatani, Miki
中科院分区：
文献类型：
--
作者：
Miwa, Masafumi;Matsuyama, Shuichi;Sakatani, Miki
分娩预测对于肉牛和奶牛的可持续生产至关重要，但目前的方法受到其高侵入性和低实用性的限制。在这里，我们比较了腹侧尾基底表面温度（ST）的变化，阴道温度（VT）和行为指数的变化。我们分析了22头肉牛的22次分娩。研究了分娩前7天内ST、VT和行为指数的每日值变化。每小时值计算为实际值减去3天内相同小时的平均值，并研究分娩前48小时内每小时值的变化。为了测试环境温度的影响，测试的奶牛被分配到两个季节组的基础上，他们所暴露的环境温度（温暖：n = 13;凉爽：n = 9），并每天和每小时的指数值进行了比较季节之间。ST下降发生在分娩前30 h左右，与VT下降的时间相似，早于行为指标的增加。此外，在分娩前的最后几个小时内观察到的ST的独特波动表明，ST不仅可以提供分娩的长期迹象，如VT，但也在短期行为指标。虽然ST比VT或行为指标对环境温度更敏感，但在温暖和凉爽的季节，ST都可以预测分娩日。
Prediction of parturition is essential for sustainable production in beef and dairy cattle, yet the present methods are limited by their high invasiveness and low utility. Here we compared prepartum changes in ventral tail base surface temperature (ST) with changes in vaginal temperature (VT) and behavioral indices. We analyzed 22 parturitions from 22 beef cows. Changes in daily values of ST, VT, and behavioral indices over the 7 days before parturition were investigated. Hourly values were calculated as the actual values minus the mean values for the same hour over a 3-day period, and the changes in hourly values over the 48 h before parturition were investigated. To test the effect of ambient temperature, tested cows were assigned to two season-groups based on the ambient temperature to which they were exposed (warm: n = 13; cool: n = 9), and the daily and hourly values of the indices were compared between seasons. A decrease in ST occurred approximately 30 h before parturition, which was similar to the time of the decrease in VT and earlier than the increase of behavioral indices. In addition, a unique fluctuation of ST observed in the last few hours before parturition indicates that ST could provide a sign for parturition not only in the long-term like VT, but also in the short-term like behavioral indices. Although ST was more sensitive to ambient temperature than VT or the behavioral indices, the day of parturition could be predicted from ST in both the warm and cool seasons.