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KMID : 0900920030270030269
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Korean journal of Animal Reproduction
2003 Volume.27 No. 3 p.269 ~ p.274
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Effect of Recombinant Bovine Somatotropin (rbST) Treatment on Concentration of Progesterone, Volume of Luteal Tissue and Pregnancy Rate in Hanwoo
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Jung Se-Hwan
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Abstract
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The purpose of this study was to determine the effect of rbST treatment on progesterone concentration, volume of luteal tissue and pregnancy rate following embryo transfer. Recipient cows were assigned to control and rbST group, of which was given a single injection of rbST (500 mg. sc) at estrus detection. The concentration of progesterone was not significantly different between control and at 0, 3, 6 days after rbST treatment. However, the concentration of progesterone at 9, 12 days was significantly higher than in control group (4.6 and 6.8 vs. 3.9 and 4.5 ng/ml P4). The pregnancy rate after embryo transfer in rbST treatment was significantly higher than in control group (64.0 vs. 47.1 %; p<0.05). The results indicated that rbST treatment in recipient cows could be improved the efficiency of pregnancy rate after embryo transfer.
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KEYWORD
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rbST, Progesterone, Pregnancy rate, Embryo transfer, Hanwoo
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