| Progesterone assays as an aid for improving reproductive efficiency in dairy cattle III. Milk progesterone profiles in repeat-breeder dairy cows |
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Byong-kyu Kang1, Han-sun Choi1, Sang-gong Choi2, Chang-ho Son1, Hong-suk Chon1 |
1College of Veterinary Medicine, Chonnam National University
2Suhkwang Livestock Co. LTD. |
| Progesterone 농도측정(濃度測定)에 의한 유우(乳牛)의 번식효율증진(繁殖效率增進)에 관한 연구(硏究) III. 저수태우(低受胎牛)에서 유즙(乳汁)중 progesterone 농도변화(濃度變化) |
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강병규1, 최한선1, 최상공2, 손창호1, 전홍석1 |
1전남대학교 수의과대학
2(주)서광 축산사업부 |
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| Abstract |
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This study was undertaken to clarify the relationship between the cause of repeat-breeder and the luteal dysfunction in repeat-breeder dairy cows that failed to conceive to three or more artificial insemination(AI) at a regular interval. Progesterone concentrations were measured in milk fat for 20 to 22 days after AI. From the 15 repeat-breeder dairy cows, six cows had a normal progesterone profiles. Five cows showed a delayed rise of the progesterone concentrations until 7 to 10 days after AI, two cows had a comparatively low concentration of milk progesterone below 150 ng/ml through most of the luteal phase, and two cows had a combined pattern of a delayed rise and a low concentration of milk progesterone during luteal phase. It is suggest that luteal dysfunction as indicated by progesterone profiles is one of the causes of repeat-breeder in dairy cows. |
| Key Words:
milk progesterone, repeat-breeder, dairy cows |
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