López-Gatius Fernando, Hunter Ronald H F
Agrotecnio Center, University of Lleida, 25198 Lleida, Spain.
Transfer in Bovine Reproduction SLu, 22300 Barbastro, Spain.
J Reprod Dev. 2019 Apr 12;65(2):191-194. doi: 10.1262/jrd.2018-111. Epub 2019 Jan 10.
In a previous study on monovular cows, follicles revealed a mean antral (follicular fluid) temperature 1.54°C cooler than rectal temperatures in ovulating cows, whereas no such temperature differences were detected in non-ovulating cows. The present study adds to our previous work, this time considering 24 bi-ovular cows (one follicle per ovary). In order to increase the number of pre-ovulatory follicles failing to ovulate, this study was performed under heat-stress conditions. Follicular temperatures of the ovulating follicles (n = 31) were 0.93°C significantly cooler (P < 0.0001) than rectal temperatures, whereas no significant differences in temperature were found in non-ovulating follicles (n = 17). Eight cows became pregnant. The results of the present study indicate that, similar to those in monovular cows, pre-ovulatory follicles in bi-ovular cows were cooler than deep rectal temperatures and those temperature gradients were not found in follicles showing ovulation failure.
在之前一项关于单胎母牛的研究中，卵泡显示出的平均窦状（卵泡液）温度比排卵母牛的直肠温度低1.54°C，而在未排卵母牛中未检测到这种温度差异。本研究是在我们之前工作的基础上进行的，此次研究对象为24头双胎母牛（每个卵巢一个卵泡）。为了增加未排卵的排卵前卵泡数量，本研究在热应激条件下进行。排卵卵泡（n = 31）的卵泡温度比直肠温度显著低0.93°C（P < 0.0001），而未排卵卵泡（n = 17）的温度没有显著差异。8头母牛怀孕。本研究结果表明，与单胎母牛类似，双胎母牛的排卵前卵泡温度低于直肠深部温度，而在未排卵的卵泡中未发现这种温度梯度。
