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KMID : 0900920020260010069
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Korean journal of Animal Reproduction
2002 Volume.26 No. 1 p.69 ~ p.72
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The Route of Administration of PGF₂α Affects Estrous Synchronization and the Subsequent Pregnancy Rate
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Baek Kwang-Soo
Lee C.-N.
Kim Tae-II
Lee Hyun-Joon
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Abstract
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Two trials were conducted in a commercial dairy on heifer synchronization with PGF₂α. Animals showing estrous following the first injection were bred and animals not showing estrus were given the second injection 10 days later. In the first trial, the injection routes were rump and rump. In the second trial, the injection routes were rump and shoulder. Estrous detection were performed from 24 h after injection. Animals were bred by the same technician. In the first trial, the response rate for the first injection was 51.4% and the subsequent pregnancy rate of these animals was 60.0%. The response rate in the second injection was 57.1% and the pregnancy rate was 50.0%. In the second trial, the response rate in the first injection on the rump was 48.7% and the subsequent pregnancy rate was 70.6%. The second injection was given on the shoulder and the response rate was 60.0% and the subsequent pregnancy rate was 25.0%. The data suggest that the route of PGF₂α administration was critical to achieve success in estrous synchronization and pregnancy rates.
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KEYWORD
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Estrous synchronization, Administration route of PGF₂α, Response rate, Pregnancy rate
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