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Estimation of growth curve parameters and analysis of year effect for body weight in Hanwoo

한우의 성장곡선의 모수추정과 연도별 효과 분석

  • 조광현 (농촌진흥청 축산연구소) ;
  • 나승환 (농촌진흥청 축산연구소) ;
  • 최재관 (농촌진흥청 축산연구소) ;
  • 서강석 (농촌진흥청 축산연구소) ;
  • 김시동 (농촌진흥청 축산연구소) ;
  • 박병호 (농촌진흥청 축산연구소) ;
  • 이영창 (농촌진흥청 축산연구소) ;
  • 박종대 (농촌진흥청 축산연구소) ;
  • 손삼규 (농촌진흥청 축산연구소)
  • Published : 2006.04.30

Abstract

This study was conducted to investigate the genetic characteristics of growth stages in Hanwoo, to provide useful information in farm management decisions. Data were taken from the nucleus herds of three farms, Namwon, Daegwalyong and Seosan, comprising 27,647 cows, 14,744 bulls, and 1,290 steers in between 1980 and 2004. According to the growth curve by year, the residuals for cows and bulls were 68.49 and 54.29, respectively, under the Gompertz model. The values were lower than in other years. Parameters, A, b and k were estimated as 423.6±5.8, 2.387±0.064 and 0.0908±0.0033 in cows and 823.3±15.3, 3.584±0.070, 0.1139±0.0032 in bulls, respectively. The fitness was higher under the Gompertz model than under the logistic model: monthly and daily estimation for cows were 379.3±7.509, 2.499±0.057, 0.114±0.0045 and 367.1±1.9003, 2.3983±0.012, 0.004±0.00003, respectively. Estimated residual mean squares were 31.85 and 998.4 in their respective models. Monthly and daily estimation of bulls were 834.6±22.00, 3.319±0.062, 0.104±0.0037 and 796.0±6.128, 3.184±0.014, 0.003±0.00003, respectively. Estimated residual mean square were 66.18 and 2106.5. Monthly and daily estimation of steers were 1049.1±144.2, 3.024±0.008, 0.067±0.0096 and 1505.1±176.6, 2.997±0.067, 0.001±0.0001, relatively. Squares, 186.0 and 1119.1. In terms of growth characteristic estimated by Gompertz model, body weight for cows and bulls were 139.53kg and 307.03kg, and the daily gains were 0.52kg and 1.04kg, respectively. Body weight for steers was 385.94kg at the inflection point. Body weight gain was 0.84kg in both models. Our results showed that cows had lower mature weight and daily weight gain, and reached the inflection point earlier than bulls or steers.

Keywords

Growth curve;Gompertz model;Body weight;Residual mean square

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