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KMID : 1005220120270020087
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Journal of Embryo Transfer
2012 Volume.27 No. 2 p.87 ~ p.92
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Reproductive Performance according to Ovarian Status, Postpartum Uterine Treatment, and Calving Season in Estrus Synchronized Dairy Cows
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Kang Hyun-Gu
Kim Ill-Hwa
Choi Woo-Jae
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Abstract
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A study on estrus synchronized dairy cows using progesterone intravaginal device was done to classify each cow's reproductive status from calving to synchronization and to evaluate the reproductive performance according to ovarian and uterine status, and calving season. From calving to estrus synchronization, silent heat or error of estrus detection among ovarian status and endometritis among uterine disorders were exposed in the most distribution (75.4% and 48.3%, respectively). The pregnancy rate of cows with inactive ovaries was lower than those in the follicular and luteal phase. And according to the uterine status before estrus synchronization, the pregnancy rate was similar in three groups; normal, endometritis, and pyometra (70.9, 69.1 and 100%, respectively). The interval from calving to conception was shorter (p<0.05) in cows calved during autumn than in cows calved during spring and winter.
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KEYWORD
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estrus synchronization , CIDR , calving season , pregnancy rate , ovarian and uterine status
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