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KMID : 0359319940340010189
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Korean Journal of Veterinary Research
1994 Volume.34 No. 1 p.189 ~ p.193
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Progesterone assays as an aid for improving reproductive efficiency in dairy cattle
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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/㎖ 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.
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