Optimum estimation of growth and development parameters about early bodyweight of local goose breeds

Growth and development regularity and genetic parameters of average week bodyweight of local goose breeds of large,medium and small type from 1 weekold to 11 week-old were fitted with four non-lineared growth models,Logistic model,Gompertz model,Bertalanfy model and Cubics model.The results showed that growth process of three geese could be demonstrated very well by four models,and all indexes of fitness were very high(more than 0.99).But Gompertz model was the best model because of its less bias of feed practice.The inflection age of growth were 5.98 weeks,5.11 weeks and 6.16 weeks in Shitou goose,Wanxi white goose and Zi goose,respectively,and bodyweight at inflection age were 2115.77,1499.08 and 1409.62 g,respectively.