兴义鸭体重生长曲线拟合与比较

摘要

为了对兴义鸭的标准化养殖和育种提供参考依据,测定了不同性别兴义鸭的早期体重,并运用Logistic、Von Bertalanffy和Gompertz 3种非线性生长模型拟合其生长曲线.结果表明,兴义鸭0～4周龄体重处于快速增长期,母鸭的生长速度高于公鸭；6～10周龄体重增长逐渐变慢,公鸭高于母鸭；3种模型均能较好地拟合兴义鸭体重的生长曲线,复相关指数(R2)均高于0.99,结合残差平方和(E)和卡方(x2)适合性检验,Gompertz模型拟合效果最好,公鸭y=1 404.492e-4.079exp(-0.382t),母鸭y=1 301.985e-4.324exp(-0.433t).综合兴义鸭体重变化规律和生长曲线拟合分析认为,兴义鸭划分为0～4周、5～10周、11周至成年3个饲养阶段较为理想.%The growth curves of Xingyi duck were separately fitted by Logistic,Von Bertalanffy and Gompertz nonlinear growth models according to measured body weight values of young male and female ducks to provide the reference basis for standardization breeding and variety selection of Xingyi duck.The results showed that the body weight of 0～4 weeks old Xingyi duck was in the rapid increment period and the growth rate of female duck was higher than male duck,but the week-growth rate of 6～10 weeks old Xingyi duck slowed down gradually and the week-growth rate of male duck was higher than female duck.Three nonlinear growth models all could better fit body weight growth curves of Xingyi duck and the fitting effect of Gompertz model was the best in three nonlinear growth models.The fitting models for male and female duck were 1404.492e-4079exp（-0.382t) and 1301.985e-4.324exp（-0.433t) respectively.Three rational breeding stages of 0～4 weeks,5～10 weeks and 11 weeks to adult were divided according to the change regulation of bodv weight and fitted growth curves.