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Study on Estimation of Relative Conception Rate in Hanwoo Bull  

Lee, Seoung-Soo (Hanwoo Improvement Center, NACL)
Noh, Seung-Hee (Hanwoo Improvement Center, NACL)
Park, No-Hyung (Dept. of Dairy Science, Hankyoung University)
Won, You-Seog (Hanwoo Improvement Center, NACL)
Publication Information
Journal of Embryo Transfer / v.25, no.1, 2010 , pp. 57-66 More about this Journal
Abstract
The conception rate of cow is a major factor in farm management. The environment of farm and management of cow are the best influencing factors on conception rate, and the fertility of bull is the second influencing factor. In Hanwoo bull, however, the informations limited to performance and carcass traits have been offered to Hanwoo farmer. Therefore, this study analysed the estimated relative conception rates (ERCR) for estimation of fertility of bulls, using the 8,892 mating data with 116 heads of prove bull to produce progeny. Mean of least square means of conception rate after first insemination was 50.95% in bull herds. On the standard of this mean, ERCRs after first insemination of each bull were analysed. Values ranged from -26.1% to +21.0%, the difference was 47.1%. Among 116 heads of bull analysed, KPN582 showed the highest ERCR as 21.0%, KPN550 (18.3%), KPN656 (16.7%), KPN632 (15.8%), KPN690 (14.9%) were gone behind, but KPN621 was the lowest as -26.1%, KPN680 (-21.3%), KPN674 (-16.2%), KPN569 (-15.9%), KPN699 (-14.9%) were succeeded. If ERCRs of Hanwoo bull will be offered to Hanwoo farmer, it will be worthwhile.
Keywords
Hanwoo; bull; fertility; estimated relative conception rate;
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