Abstract: The growth curves of Zhejiang White goose from 0 to 8 weeks old were analyzed and fitted with three kinds nonlinear model(Logistic, Gompertz, Von Bertalanffy). The results showed that the males and females had the same growth state before 3 weeks old, and then the males got a higher growth rate than females until the end of the observation. The growth curves were appropriately fitted with three models (R²＞0.99), but the best model fitted the growth curve of different goose population was different, in general, the Gompertz model had the best effect on fitting with the growth curves of goose, the forecasting results Gompertz model of the final weight, the inflection point week old, and maximal growth per week all were better than that of the other two models. Further analysis indicated that the parameters of fitting curves represent inflection point weight in males both were higher than those in females, there was no significant difference found in inflection point week old between males and females. This paper would provide the message for growth rules in different sexual of Zhejiang White goose, and their nutrient and environmental needs, and also provide guide for extensive raising Zhejiang White goose.

Key words: Zhejiang White goose; growth rhythm and curve; Gompertz model; fitted curve