白羽番鸭生长曲线拟合比较分析

试验测定不同性别法国白羽番鸭早期体重，用Logistic、Von Bertalanffy和Gompertz 3种非线性生长模型拟合其生长曲线。研究结果表明，白羽番鸭公鸭、母鸭4周龄前生长缓慢，后期公鸭生长快于母鸭；通过比较拟合优度（R2）、残差平方和（E）和进行适合性χ2检验结果发现，Gompertz模型拟合效果最佳。进一步比较不同性别Gompertz模型拟合参数，结果发现公鸭与母鸭相比，有较高的初始体重、极限体重、最大周增重和拐点体重，较低的初始生长速度。公鸭拐点周龄为7.03周，较母鸭的5.37周龄晚；公鸭4周龄前相对生长率小于母鸭，4周龄后则超过母鸭，绝对生长率差异较大。

Comparison on Growth Curve Fitting of White Muscovy

he early bodyweight of White Muscovy with different gender were measured, and three nonlinear curves of Logistic, Von Bertalanffy and Gompertz model were used to fit the growth curve in this study. The results showed that White Muscovy grown slowly before the age of 4 weeks, but the male Muscovy showed higher growth rate than female duck after this stage. The Gompertz model generated the best effect concerned with goodness of fit(R2), residual sum of squares(E), and suitability of χ2 test. Further more, the fitting parameters of Gompertz model between genders were compared, the male Muscovy showed higher initial weight, mature weight, largest weight gain per week and inflection point weight and lower initial growth rate than female Muscovy . The inflection age of male Muscovy was 7.03 weeks and female Muscovy was 5.37 weeks, respectively. The relative growth rate of male Muscovy was lower than female before 4 weeks but higher after 4 weeks and the difference of absolute growth rate was high between genders.