- Volume 44 Issue 2
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Study on the Optimum Range of Weight-Age Data for Estimation of Growth Curve Parameters of Hanwoo
한우의 체중 성장곡선 모수 추정을 위한 체중 측정 자료의 최적 범위에 관한 연구
- Cho, Y.M. (National Livestock Research Institute, R.D.A) ;
- Yoon, H.B. (School of Agricultural Biotechnology, Seoul National University) ;
- Park, B.H. (School of Agricultural Biotechnology, Seoul National University) ;
- Ahn, B.S. (National Livestock Research Institute, R.D.A) ;
- Jeon, B.S. (National Livestock Research Institute, R.D.A) ;
- Park, Y.I. (School of Agricultural Biotechnology, Seoul National University)
- 조용민 (농촌진흥청 축산기술연구소) ;
- 윤호백 (서울대학교 농생명공학부) ;
- 박병호 (서울대학교 농생명공학부) ;
- 안병석 (농촌진흥청 축산기술연구소) ;
- 전병순 (농촌진흥청 축산기술연구소) ;
- 박영일 (서울대학교 농생명공학부)
- Published : 2002.04.30
Mature weight (A) and rate of maturing (k) estimated by nonlinear regression were studied to determine the optimum age range over which the estimate of growth curve parameters can be estimated. The weight-age data from 1,133 Hanwoo bulls at Hanwoo Improvement Center of N.A.C.F. were used to fit the growth curve using Gompertz model. All available weight data from birth to the specific age of months were used for the estimation of parameters: the six specific ages used were 12, 14, 16, 18, 20 22 and 24 months of age. The mean estimates of mature weight (A) were 966.5, 1,255.9, 1,126.2, 916.5, 842.2, 780.9 and 767.0kg for ages 12 through 24 months, respectively. The mean estimates of mature weight (A) to 22 and 24 months of age were not different from each other. However, they were different from the estimates based on the data to other ages. Mean estimates of rate of maturing (k) were 3.362, 3.595, 3.536, 3.421, 3.403, 3.409 and 3.411 for ages 12 through 24 months, respectively. The mean estimates of maturing rate (k) for ages 18 through 24 months of age were not significantly different from each other. However, they were different from the estimates based on the data to other ages. Correlations among estimates of A at various ages showed the highest value of 0.93 between 22 and 24 months. Correlations among estimates of k at various ages were highest ranging from 0.91 to 0.99 among 18 to 24 months. The correlations between A and k were positive and tended to decrease with the increase of the age from 0.84 for the age of 12 months to 0.10 for the age of 24 months. Thus, the estimates of growth curve parameters, A and k, suitable for genetic studies can be derived from accumulated Hanwoo bulls after 22 months of age.
Hanwoo;Age;Weight;Growth curve parameters
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