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KMID : 1023620120360030213
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Reproductive and Developmental Biology
2012 Volume.36 No. 3 p.213 ~ p.217
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Analysis of Estimation of Relative Conception Rate on Korean Proven Bull Number Semen using Non-return Rate
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Yoon Sung-Jae
Hwang Chae-Hyeon
Lee Si-Hwa
Lee Myeung-Sik
Lee June-Sub
Kwon Woo-Sun
Park Yoo-Jin
You Young-Ah
Park Myung-Geol
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Abstract
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The decreased fertility is frequently thought to be problem of cattle production. However, studies figure out that number of these problems is related to bull factors especially in artificial insemination setting. Therefore, this study was designed to investigate the fertility status of bull by their estimated relative conception rate of cows that were inseminated by frozen semen from Korean proven bulls. Here we use the non-return rate (NRR) to access the bull fertility whereas, the NRR was define as the proportion of bulls that semen were used to inseminate cows and the number of cows that did not return for another service within 60 days. The data from 54,388 artificial inseminations (AI) were analyzed from 88 KPN semen. The NRRs of highest and lowest fertile bull were 83.81 and 51.33%, respectively. And mean NRR was 68.27%. In comparison to previously reported study, our data shows 17.38% higher NRR and the absolute value of difference in 50%>NRR and 50%
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KEYWORD
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Hanwoo, KPN semen, Artificial insemination, Non-return rate, Estimated relative conception rate
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