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KMID : 0359319900300020243
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Korean Journal of Veterinary Research
1990 Volume.30 No. 2 p.243 ~ p.247
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Studies on the improvement of reproductive efficiency in Korean native cows
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Abstract
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A study was conducted to improve the reproductive performance of Korean native cows. Plasma progesterone concentrations were determined by radioimmunoassay during the estrous cycle and early pregnancy.
Plasma progesterone concentrations during the estrous cycle in the 15 cows were the lowest (0.30ng/㎖) at estrus, gradually increased after 6 days, remained high from 8 to 17 days (3.87∼5.59ng/㎖) and drastically decreased thereafter to reach minimal concentrations at the next estrus.
Plasma progesterone concentrations of the 10 pregnant cows at 20 days after insemination were 5.82±1.33ng/㎖ (mean±SD) and those of 10 non-pregnant cows were 0.30±0.21ng/㎖, respectively. Therefore, plasma progesterone concentrations in the pregnant cows at 20 days after insemination were significantly higher than in non-pregnant cows (p<0.001).
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