Duration of estrus induced after GnRH‐PGF2α protocol in dairy heifer |
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Authors: | Chikako YOSHIDA Muhammad YUSUF Toshihiko NAKAO |
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Institution: | 1. Present address: Field Center for Sustainable Agriculture and Forestry, Faculty of Agriculture, Niigata University, Niigata, Japan;2. Laboratory of Theriogenology, Department of Veterinary Clinical Sciences, Faculty of Agriculture, Yamaguchi University, Yamaguchi, Japan |
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Abstract: | Estrous expressions in dairy cows have been shortened and weakened. Dairy heifers, on the other hand, may not have had such changes in estrous signs as observed in cows, since they have less stresses than cows. The aim of this study was to describe the duration of estrus in a herd of dairy heifers. A total of 56 Holstein Friesian heifers estrus was synchronized using two different hormonal protocols. They were checked for primary and secondary estrous signs with the help of heat detection devices for 48 h at an interval of 4 h starting at 16.00 hour, one day after PGF2α treatment. Onset and end of standing estrus during 48 h observation period was recorded in 35 of the 44 heifers coming into estrus within 5 days after PGF2α treatment during the observation period. The duration of standing estrus on the average (±SD) was 9.7 ± 5.3 h. Percentage of heifers with standing estrus longer than 12 h was 40%, and 53% showed standing estrus only for 4–8 h. It is indicated that duration of estrus in dairy heifers has been shortened recently. |
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Keywords: | dairy heifer duration of estrus |
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