溧阳鸡生长曲线分析与拟合的研究

运用Logistic模型和Gompertz模型对溧阳鸡0~12周龄生长曲线进行了分析和非线性的拟合研究。结果表明,溧阳鸡公、母鸡在3周龄前生长曲线基本一致,之后公鸡则明显高于母鸡,且保持较长时间的快速生长状态。Logistic模型和Gompertz模型均能比较好地拟合溧阳鸡公鸡的生长曲线(R2分别为0.994 4和0.995 3)和母鸡的生长曲线(R2分别为0.996 7和0.997 9),但Gompertz模型在拟合度和预测体重效果方面相对较好。拟合曲线模型中代表极限体重的参数A,公鸡明显高于母鸡,其他参数接近或略有差异。

Analysis and fitting of growth curves in Liyang chicken

The growth curves of Liyang chicken of 12 weeks old were analyzed and fitted with two kinds of non-lineared models.The results indicated that the males and females had the same growth curve before 3 weeks old,And then,the males got a higher growth rate than females did.The growth curves could be fitted by Logistic model and Gompertz model for males(R~2=0.994 4 and 0.995 3,resp.) and females(R~2=0.996 7 and 0.997 9,resp.).But Gompertz model was considered to be the best model to fit growth curves of Liyang chickens because of its higher fitness and less bias of predicted body weight on the given age.The parameters of fitted curves representing the maximum body weight in males were higher than those in females.