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KMID : 1025520030450050711
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Journal of Animal Science and Technology
2003 Volume.45 No. 5 p.711 ~ p.724
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Factors Affecting Growth Curve Parameters of Hanwoo Cows
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이창우/Lee, C. W.
최재관/전기준/나기준/이채영/황정미/김종복/Choi, J. G./Jeon, K. J./Na, K./Lee, C./Hwang, J. M./Kim, J. B.
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Abstract
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Some growth curve models were used to fit individual growth of 1,083 Hanwoo cows born from 1970 to 2001 in Daekwanryeong branch, National Livestock Research Institute(NLRI).
The effects of year-season of birth and age of dam were analyzed. In analysis of variance for growth curve parameters, the effects of birth year-season were significant for mature weight(A), growth ratio(b) and maturing rate(k)(P＜.01). The effects of age of dam were significant for growth ratio(b) but not significant for mature weight(A) and maturing rate(k). The linear term of the covariate of age at the final weights was significant for the A(P＜.01) and k(P＜.01) of Gompertz model, von Bertalanffy model and Logistic model. For the growth curve parameters fitted on individual data using Gompertz model, von Bertalanffy model and LOgistic model, rusulting the linear contrasts(fall-spring), Least square means of A in three nonlinear models were higher cows born all fall and A of Logistic model was significant(P＜.05) between the seasons.
According to the results of the least square menas of growth curve parameters by age of dam, least square means of mature weight(A) in Gompertz model was largest in 6 year and smallest estimating for 3 and 8 years of age of dam. The growth ratio(b) was largest in 2 year of age of da and smallest estimating in 8 year. The A and k were not different by age of dam(p＞.05), On the other hand, the b was different by age of dam.(p＜.01).
The estimate of A in von Bertalanffy model was largest in 6 year and smallest in 8 and 9 years of age of dam. The b was largest in 2 year and tend to decline as age of dam increased. The A and k were not different by age of dam(p＞.05), On the other hand, the b was highly significant by age of dam(p＜.01).
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