应用Gompertz、Logistic和Bertalanffy模型分别对北京鸭、绍兴鸭2~14周龄体重进行曲线拟合分析。结果表明:Gompertz模型对北京鸭体重拟合较好,Bertalanffy模型对绍兴鸭体重拟合较好。根据模型结果,北京鸭、绍兴鸭的拐点周龄分别为3.5周龄左右和2.8周龄左右,成熟体重分别为3.5~3.9 kg和1.25~1.35 kg。 Gompertz, Logistic and Bertalanffy models were used to curve fit the body weights of Beijing duck and Shaoxing ducks at 2 ~ 14 weeks. The results show that the Gompertz model fits well to Beijing duck, and the Bertalanffy model fits the Shaoxing duck better. According to the results of the model, the inflection points of Beijing duck and Shaoxing duck were 3.5 weeks old and 2.8 weeks old, respectively, and the mature body weights were 3.5-3.9 kg and 1.25-1.35 kg respectively.