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Effects of Various Synchronization Methods on Postpartum Reproduction in Hanwoo  

Lee M. S. (National Livestock Research Institute, R.D.A.)
Park J. J. (National Livestock Research Institute, R.D.A.)
Jung Y. H. (National Livestock Research Institute, R.D.A.)
Park S. B. (National Livestock Research Institute, R.D.A.)
Suh G. H. (National Livestock Research Institute, R.D.A.)
Kang M. J. (Chonnam University)
Moon S. J. (Chonnam University)
Kim C. K. (ChungAng University)
Publication Information
Journal of Embryo Transfer / v.20, no.1, 2005 , pp. 49-53 More about this Journal
Abstract
This study was conducted to investigate the effects of repetition usage of various estrus synchronization and seasonal breeding in Hanwoo. Body weight(kg) at birth and weaning in calves produced by seasonal breeding are 24.0kg, 75.6kg in female, 24.9kg, 78.3kg in male, respectively. Changes of birth weight(kg) by parity in Hanwoo increased gradually. Raising rates of calves by raising experience of farmer higher than in more 10 years as $88.4\%$ and in more 6 years as $84.0\%$. Delivering rates by induced estrus methods in $PGF_{2}{\alpha}$, PRID, CIDR and $GnRH-PGF_{2}{\alpha}-GnRH$ were $87.0\%$, $87.3\%$, $91.6\%$ and $96.0\%$, respectively. Conception days of post-partum following to induced estrus methods in Control, $PGF_{2}{\alpha}$ PRID, CIDR and $GnRH-PGF_{2}{\alpha}-GnRH$ were 137.1, 147.6, 141.3, 116.6 and 118.0 days, respectively. The results show that repetition usage of various estrus synchronization were not effective on postpartum reproduction in Hanwoo.
Keywords
postpartum reproduction; estrus synchronization; conception rate;
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