Comparison of growth laws of different breeds of chickens and the mimetic growth curves.

Studies on the law of body growth of 0~12-week-old Rugao chicken(RG),Wenchang Chicken(WC),and Anka Chicken(AK),and the nonlinear curves of Logistic model were used to fit the growth model.The result s were as follows.There were significant differences(P0.05) in the body weight between male and female in 2~12-week-old,but the growth and development had the same change.There were great differences between the breeds of chickens,because the growth and development had significant differences in all time among breeds,but there was no significant difference in the relative growth rate on 6-week-old and absolute mass growth per day on 12-week-old between RG and WC,and in the relative growth rate on 10-week-old between RG and AK.All the three breeds of chickens' growth can be demostmted greatly according to Logistic model(R20.99).The predicted body weight was close to ture body weight.