Three non-linear growth models (logistic, Gompertz and von Bertalanffy) were used

to describe and estimate growth parameters of 10-week age-body weight relationship of mixed-sex

Egyptian indigenous geese. The estimated asymptotic weight (A), scaling parameter (B), maturity index

(K), inflection weight (Wi) and time (Ti) were respectively 3254.00 g, 13.15, 0.48 g/day, 1627 g and

5.37 weeks; 3895.00 g, 3.33, 0.25, 1431.99 g and 4.81 weeks; and 4559.00 g, 0.72, 0.17, 1350.81

g and 4.53 weeks for the logistic, Gompertz and von Bertalanffy growth function. The application

of four goodness-of-fit criteria [coefficient of determination (R2), root mean square error (RMSE),

Akaike’s information criterion (AIC) and Bayesian information criterion (BIC)] revealed that von

Bertalanffy was the best fitting model describing age-body weight relationship of Egyptian native geese.

This was premised on the fact that the von Bertanlanffy model had the highest R2 (0.896) and lowest

RMSE (327.05), AIC (8806.50) and BIC (5747.86) compared with the Gompertz (R2: 0.897; RMSE:

328.70; AIC: 8813.05; BIC: 5754.40) and logistic (R2: 0.891; RMSE: 338.90; AIC: 8841.71; BIC:

5783.07) models. The information provided in this study could be exploited for planning appropriate

management practices and further genetic studies on improvement of Egyptian native goose for increased

body weight.