Obstetrics and Reproduction Area, Faculty of Veterinary, Department of Animal Pathology, University of Zaragoza, Spain.
Vet Rec. 2013 Jun 1;172(22):579. doi: 10.1136/vr.101221. Epub 2013 May 25.
Different physical and physiological parameters may be used to determine ovulation time in sows. In the present study, we analysed the ear and vulvar skin temperature fluctuations, and the changes in genital electrical resistance, at a distance of 4, 8 and 12 cm from the vulva during oestrus in order to predict the time of ovulation. Multiparous sows were checked by transrectal real-time ultrasonography and luteinising hormone (LH) plasma concentration was determined. Temperature was measured using a thermoprecision infrared thermometer, and the electrical resistance was measured with a commercial resistance probe. All measurements were carried out every 12 hours from one day after the weaning to three days after oestrus onset. Skin temperature showed significant difference around periovulatory period. The electrical resistance at 4 cm from the vulva showed marked changes during oestrus, which were different from those described at 8 and 12 cm from the vulva. At 12 hours before ovulation time, skin temperature decreased significantly, and negative correlation (P<0.05) was found between vulvar skin temperature and vaginal resistance. There was no relationship between skin temperature, electrical resistance and LH plasma concentration. The measurement of several physiological traits may provide more accurate predictions of the moment of ovulation.
不同的生理和物理参数可用于确定母猪的排卵时间。在本研究中，我们分析了发情期间母猪外阴 4、8 和 12 厘米处的耳和外阴皮肤温度波动以及生殖器电阻的变化，以预测排卵时间。经直肠实时超声检查多产母猪，并测定黄体生成素（LH）的血浆浓度。使用热精密红外测温仪测量温度，使用商业电阻探头测量电阻。从断奶后一天到发情开始后三天，每 12 小时进行一次所有测量。皮肤温度在排卵期间有显著差异。外阴 4 厘米处的电阻在发情期间发生明显变化，与外阴 8 和 12 厘米处的描述不同。在排卵前 12 小时，皮肤温度显著下降，外阴皮肤温度与阴道电阻呈负相关（P<0.05）。皮肤温度、电阻和 LH 血浆浓度之间没有关系。测量几种生理特征可能会更准确地预测排卵时间。
