半番鸭及其亲本生长曲线拟合与杂种优势分析

实验测定了樱桃谷鸭、白羽番鸭、苏牧麻鸭、白羽番鸭♂×樱桃谷鸭♀(樱番鸭)、白羽番鸭♂×苏牧麻鸭♀(苏番鸭)早期体重数据,发现樱番鸭杂种优势率为12.8%,苏番鸭为22.04%。用Logistic、Von Bertalanffy和Gompertz3种非线性生长模型拟合其生长曲线,通过比较拟合优度、复相关指数和进行适合性χ2检验,发现Gompertz模型拟合效果最好。比较5组鸭Gompertz模型拟合参数,结果表明:在亲本鸭组中白羽番鸭初始重较樱桃谷鸭和苏牧麻鸭高,初始生长速度、最大周增重较这2个亲本组低,拐点时间也比其晚。2个杂交组最大周增重、成熟速度、极限体重、拐点体重、初始重和拐点时间都有很大提高,存在明显的杂种优势。

Growth Curve Fitting and Heterosis Analysis of Mule Duck and Its Parental Lines

The early bodyweight of White Muscovy,Cherry Valley duck,Sumu duck,White Muscovy♂×Cherry Valley duck♀,White Muscovy♂× Sumu duck♀ 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 Gompertz model generated the best effect concerned with goodness of fit(R2),residual sum of squares(E),which the suitability of χ2 test.Further more,the fitting parameters of 5 groups fitted by Gompertz model were compared,which the results indicated that White Muscovy had higher body weight than Cherry Valley duck and Sumu duck,but initial growth rate and weight gain per week were lower than other two groups,and the inflection age was later also.There were high increase in weight gain per week,mature speed,mature weight,inflection point weight,initial weight and inflection age in the two duck crossed groups compared with pure-blood ducks,which had obvious heterosis.