비발정 재귀율을 이용한 한우 보증씨수소 수정능력의 상대적 추정치 분석Analysis of Estimation of Relative Conception Rate on Korean Proven Bull Number Semen using Non-return Rate
- Authors
- 윤성재; 황채현; 이시화; 이명식; 이준섭; Md Saidur Rahman; 권우성; 박유진; 유영아; 방명걸
- Issue Date
- 2012
- Publisher
- 한국동물번식학회
- Keywords
- Hanwoo; KPN semen; Artificial insemination; Non-return rate; Estimated relative conception rate
- Citation
- Reproductive & Developmental biology, v.36, no.3, pp 213 - 217
- Pages
- 5
- Journal Title
- Reproductive & Developmental biology
- Volume
- 36
- Number
- 3
- Start Page
- 213
- End Page
- 217
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/27263
- ISSN
- 1738-2432
- Abstract
- 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%<NRR group was 22.17 and 10.51, respectively (p<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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