Analysis of Estimation of Relative Conception Rate on Korean Proven Bull Number Semen using Non-return Rate
2012
Yoon, S.J., Chung-Ang University, Anseong, Republic of Korea | Hwang, C.H., UMOCRACY, Changwon, Republic of Korea | Lee, S.H., Dan-gye Artificial Insemination Center, Sancheong, Republic of Korea | Lee, M.S., National Institute of Animal Science, RDA, Pyeongchang, Republic of Korea | Lee, J.S., Chung-Ang University, Anseong, Republic of Korea | Rahman, MD Saidur, Chung-Ang University, Anseong, Republic of Korea | Kwon, W.S., Chung-Ang University, Anseong, Republic of Korea | Park, Y.J., Chung-Ang University, Anseong, Republic of Korea | You, Y.A., Chung-Ang University, Anseong, Republic of Korea | Pang, M.G., Chung-Ang University, Anseong, Republic of Korea
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% greater than NRR and 50% less than NRR group was 22.17 and 10.51, respectively (p less than 0.001). In conclusion, the decreased fertility might consider as key aspect in achieving considerable conception of cows in existing integrated farming system at Korea.
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