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Effects of Raising Farm on Genetic Evaluation for Carcass Traits in Hanwoo Cows

사육농가의 효과가 한우 암소의 도체형질 유전 평가에 미치는 영향

  • Lee, Chang-Woo (Gangwon Province Livestock Research Center) ;
  • Lee, Cheong-Mook (Pyongchang-Youngwol-Jungsun Livestock Cooperative Federation) ;
  • Lee, Sung-Jin (College of Animal Life Sciences, Kangwon National University) ;
  • Song, Young-Han (College of Animal Life Sciences, Kangwon National University) ;
  • Lee, Jeong-Koo (College of Animal Life Sciences, Kangwon National University) ;
  • Kim, Jong-Bok (College of Animal Life Sciences, Kangwon National University)
  • 이창우 (강원도축산기술연구센터) ;
  • 이정묵 (평창영월정선축협) ;
  • 이성진 (강원대학교 동물생명과학대학) ;
  • 송영한 (강원대학교 동물생명과학대학) ;
  • 이정구 (강원대학교 동물생명과학대학) ;
  • 김종복 (강원대학교 동물생명과학대학)
  • Received : 2011.05.03
  • Accepted : 2011.07.28
  • Published : 2011.08.31

Abstract

This research was conducted to analyze the effects of raising farm on the heritability and breeding values of Hanwoo cows for their carcass traits, including cold carcass weight (CWT), back-fat thickness (BFT), eye-muscle area (EMA) and marbling score (MAR). The carcass data and pedigree data were collected from steers raised on Hanwoo farms in Pyeongchang-gun, Gangwon-do, South Korea. Three analytical models were applied for the estimation of heritabilities and breeding values. The first model (model 1) included slaughter house-year-month combination as fixed effects and age at slaughter was fitted as linear and quadratic covariates. The second model (model 2) was similar to model 1, but raising farm was additionally included as random effect. The third model (model 3) was similar to model 1 but farm effects were additionally included as fixed effect. The comparisons between the model 1 and the models including farm effect (model 2 and model 3) revealed that heritability estimates from model 2 or model 3 were smaller to those from model 1 for all carcass traits. Especially, obvious decrease of heritability was observed in CWT where heritability was 0.23 from model 1, 0.15 from model 2 and 0.18 from model 3. The maximum log likelihood of the model 2 and 3 were higher than those of model 1 for all traits. In model 2 that raising farm was included as a random effect, the ratio of farm variance to the total phenotypic variance were ranged from 4% (EMA) to 18% (CWT). Top 10% and bottom 10% of female cows were selected based on the breeding values from model 1, and the Spearman's rank correlation coefficients among models were estimated for each trait within selected group. The correlation coefficients were ranged from 0.57 to 0.95 in top 10% group and from 0.68 to 0.95 in bottom 10% group. These results show that the discrepancies in the rankings of breeding values can be based on the models applied. In conclusion, the results obtained in this study suggest that the herd effect or farm effect should be included in the analytical model when breeding values are estimated with the purpose of improvement of carcass traits of Hanwoo breeding cows.

Keywords

Hanwoo;Carcass trait;Farm effect;Heritability

Acknowledgement

Supported by : 농촌진흥청

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