京海黄鸡生长模型拟合的研究

Analysis of fitting growth model in Jinghai yellow chicken

用Logistic,Gompertz和Bertalanffy 3种非线性生长模型对不同性别京海黄鸡的生长发育进行拟合。研究结果表明,京海黄鸡公、母鸡在3周龄前生长曲线基本一致,而3周龄后公鸡明显快于母鸡;3种模型的拟合效果均很好,尤以Bertalanffy模型最佳;公、母鸡的生长拐点分别为12.81周和11.13周,公鸡的成年体重显著高于母鸡,但达到拐点的周龄较母鸡迟;3种模型的相对生长率所反映的生长规律基本相同:无论公母鸡,在6周龄之后,其相对生长率基本一致,但绝对生长率却存在差异。

Three nonlinear curves of Logistic, Gompertz and Bertalanffy model were used to fit the growth model in Jinghai yellow chicken of both sex. The results indicated that cock and hen grew approximately consistent before the age of 3 weeks, but cock grew faster than hen after the age of 3 weeks. The fitting results of three kinds of models were all perfect; especially Bertalanffy model was the best. The growth inflexion of cock and hen were the age of 12. 81 weeks, and 11.13 weeks respectively. The mature body weight of cock was higher than the hen significantly, but the inflexion weeks were late to that of hen relatively; the growth law reflected by the relative growth rate was basically same： no matter what it was cock or hen, the relative growth rates were approximately consistent; but there were some difference among the absolute growth rates.