Vaginal Temperature Fluctuation around Estrus in Dairy Cattle.

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Body (vaginal) temperature was recorded continuously to determine a reliable method of measuring body temperature for detecting estrus in dairy cattle. Three Holstein heifers, 11 to 15 months of age and each with a portable dataloger attached to their backs, were released in an outside paddock. The vaginal temperature was recorded by the datalogger at two-minute intervals. During the 50-day experimental period, estrus was observed eight timcs, and the lowest vaginal temperature (LVT) in the morning showed a characteristic change between days immediately before estrus, as follows. (1) The LVT in the morning began to decrease two or three days before estrus and reached its minimum level on the day before estrus. The decrease in LVT between days before estrus varied from 0.1 to 0.8℃. (2) The LVT increased 0.3 to 0.6℃ on the day of estrus compared to the previous day. (3) When estrus extended to the next day, LVT remained at a high level. (4) LVT returned to normal level after estrus. The LVT was found most frequently around 0800h and 87% of the LVT were observed between 0500 and 0900h. The LVT often appeared 30 to 60 minutes after the heifers stood up. It is, therefore reasonable to measure body temperature in the morning and before feeding, while the animal is standing, to detect estrus in dairy cattle, Key words : vaginal temperature, dairy cattle, estrus detection, heifer Jpn. J. Livest. Management, 28(2) : 50-54. 1992. Received November 25,1991.
日本家畜管理学会の論文
1992-09-01

Vaginal Temperature Fluctuation around Estrus in Dairy Cattle.

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