The growth curves of 16 male and 31 female Huainan spotted-brown chickens from 1 day-old to 180 day-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 60 day-old.And then,the males got a higher growth rate than females did.The growth curves could be fitted very well by logistic model and Gompertz model for males (R 2=0 9989 and 0 9998,resp.) and females (R 2=0 9951 and 0 9981,resp.).Gompertz model was considere...