Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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The Effect of the Incomplete Lactation Records for Genetic Evaluations with Random Regression Test-Day Models (RRTDM) in Holstein Cattle

불완전 검정일 기록이 RRTDM을 이용한 홀스타인 젖소의 유전평가에 미치는 영향

  • Cho, J.H. (Dairy Cattle Improvement Center, N.A.C.F.) ;
  • Cho, K.H. (National Livestock Research Institute, R.D.A.) ;
  • Lee, K.J. (Department of Animal Biotechnology, College of Animal Husbandry, Konkuk University)
  • 조주현 (농협중앙회 가축개량사업소 젖소개량부) ;
  • 조광현 (농촌진흥청 축산연구소) ;
  • 이광전 (건국대학교 동물생명과학부)
  • Published : 2005.04.30
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Abstract

The purpose of this study was to find out the effects that daughters' incomplete lactation records affect sire's breeding values through genetic evaluation using RRTDM(random regression test-day model). First, we estimated genetic parameters and breeding values on sires having complete lactation records of daughter by RRTDM, second, we changed complete lactation records of specific sires into incomplete records by various methods. Third, the breeding values were compared between complete and incomplete records. Finally, this study aimed to find out the methods to minimize the estimation errors of young bulls' breeding values. Data used in this study were collected from the dairy herd improvement program, and a total of 97,562 records were composed of 10,929 first parity with both parents known, since 1999. Breeding values on the daughters from randomly chosen sires were calculated and compared with among 90 day, 150day, and 200 day's incomplete records. For milk yields, sire's ranks of breeding values used by complete lactation records were very different from sire's ranks of breeding values obtained by incomplete lactation records(Rank_90 cut, 150cut, 200 cut).The differences were also obtained between complete lactation records(per305_full) and incomplete lactation record (per_90 cut, 150cut, 200 cut) in breeding values regarding persistency. Especially, the differences between per_90 cut and per305_full were very large(from 1.8 kg to 145kg).

Keywords

References

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