KMID : 1005220140290040321
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Journal of Embryo Transfer 2014 Volume.29 No. 4 p.321 ~ p.325
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Efficacy of a Cue-Mate Intravaginal Insert and Injection of Prostaglandin F2¥á for Synchronizing Estrus in Hanwoo Cattle
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Cho Sang-Rae
Kumar Kuldeep Yeon Seong-Heum Lee Sung-Hwan Kim Ui-Hyung Chung Ki-Yong Kim Hyeon-Shup Lee Myeung-Sik Park Chang-Seok Yang Byoung-Chul
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Abstract
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The present study was performed on farm animals to test the effectiveness of progesterone-releasing intravaginal device (Cue-Mate¢ç 1.56 g) and injection of prostaglandin F2¥á (PGF2¥á) for synchronization estrus in Hanwoo cattle. The cattle were at random stage of the estrus cycle. The cows were artificially inseminated at day 7 after Cue-Mate withdrawal, using commercial semen from Korean native bulls. There was a season effect on the estrus synchronization rate. It was higher in spring (94.3%) followed by winter (93.3%), autumn (90.4%) and summer (67.2%). In summary, The results of this study revealed that season has influences on estrus behavior of cattle with no significant effect on pregnancy rate. In summary, we suggest summer reproductive management to alleviate the effects of heat stress. It should be based on intensive cooling combined with hormonal treatment. Given that different subgroups of cows benefit differently from the treatments, selective hormonal administration should be considered.
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KEYWORD
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estrus , synchronization , CIDR , Cue-mate
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