Department of Animal Sciences, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan.
Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine, Hokkaido 080-8555, Japan.
J Reprod Dev. 2024 Feb 19;70(1):49-54. doi: 10.1262/jrd.2022-116. Epub 2023 Nov 23.
Pre-ovulatory follicles are cooler than the neighboring reproductive organs in cows. Thus, measuring the temperature of reproductive organs could be a useful method for predicting estrus and ovulation in cows, and the establishment of a non-invasive technique is required. In this study, we used infrared thermography (IRT) to measure ocular surface temperature as a potential surrogate for reproductive organ temperature. Five Japanese Black cows with synchronized estrus were subjected to temperature measurements in five regions of the ocular surface, including the nasal conjunctiva, nasal limbus, center cornea, temporal limbus, and temporal conjunctiva, twice a day (0800 h and 1600 h) during the experimental period. The temperatures in the five regions significantly declined in cows from estrus to ovulation. To the best of our knowledge, this study is the first to use IRT to show a temperature decrease in the ocular surface along with estrus to ovulation in Japanese Black cows.
在牛中，排卵前卵泡比邻近的生殖器官温度低。因此，测量生殖器官的温度可能是预测奶牛发情和排卵的一种有用方法，需要建立一种非侵入性技术。在这项研究中，我们使用红外热像仪（IRT）测量眼表面温度作为生殖器官温度的替代指标。对 5 头具有同步发情的日本黑牛进行眼表面五个区域（鼻结膜、鼻缘、中央角膜、颞缘和颞结膜）的温度测量，在实验期间每天两次（0800 h 和 1600 h）。从发情到排卵，五个区域的温度在奶牛中显著下降。据我们所知，这项研究首次使用 IRT 显示了日本黑牛发情到排卵期间眼表面温度的下降。
