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Effect of Duration Treated on Reproductive Performance in Holstein Cows Treated with Progesterone with and without Estradiol  

Baek, K.S. (Dairy Science Division, National Institute of Animal Science, R.D.A.)
Lee, W.S. (Dairy Science Division, National Institute of Animal Science, R.D.A.)
Park, S.B. (Dairy Science Division, National Institute of Animal Science, R.D.A.)
Park, S.J. (Dairy Science Division, National Institute of Animal Science, R.D.A.)
Kim, H.S. (Dairy Science Division, National Institute of Animal Science, R.D.A.)
Lee, H.J. (Dairy Science Division, National Institute of Animal Science, R.D.A.)
Ki, K.S. (Dairy Science Division, National Institute of Animal Science, R.D.A.)
Kang, S.J. (Dairy Science Division, National Institute of Animal Science, R.D.A.)
Ahn, B.S. (Dairy Science Division, National Institute of Animal Science, R.D.A.)
Publication Information
Journal of Embryo Transfer / v.22, no.3, 2007 , pp. 195-198 More about this Journal
Abstract
This study was carried out to investigate the effects of hormones treated (progesterone, and combination of progesterone and estradiol) on the reproductive performance of dairy cattle. The intravaginal CIDR was inserted in the vagina of cow on day 14 (P-7, PE-7), 16 (P-5, PE-5) and 18 (P-3, PE-3) post-insemination to stimulate progesterone secretion with (PE) and without estradiol(P). The CIDR was removed on 7 (P-7, PE-7), 5 (P-5, PE-5) and 3 (P-3, PE-3) days after. The cows for control group were not treated with CIDR or hormones. Conception rate, the duration needed for conception after AI and the number of AI services needed for conception were measured. Conception rate in control, CIDR without estradiol (P-7, P-5 and P-3) and CIDR treated (PE-7, PE-5 and PE-3) cows were 15.8%, 40.0%, 31.5%, 28.6%, 62.5%, 50.0% and 0%, respectively. The days needed for conception after AI in control, P-7, P-5, p-3, PE-7, PE-5 and PE-3 were 64.9, 63.0, 59.1, 8.0, 0.0, 18.9 and 83.3 days, respectively. The days needed for conception in cows treated with CIDR (PE-7) has shown longer than control and PE-3 (p<0.05). The number of AI services needed for conception in control, CIDR (PE-7, PE-5 and PE-3) and CIDR without estradiol treated cows (P-7, P-5 and P-3) were 27, 2.3, 1.9, 1.3, 1.0, 1.7 and 2.8 times, respectively. The number of AI services needed for conception have shown significantly lower in PE-7 compared to control and PE-3.
Keywords
Holstein; progesterone; estradiol; CIDR; conception rate;
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Times Cited By KSCI : 1  (Citation Analysis)
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