崇明白山羊生长曲线的拟合与分析

本实验旨在研究崇明白山羊的生长发育规律。测定不同性别崇明白山羊0～18月龄的体重、体高、体长和胸围,采用Gompertz、Logistic和Von Bertalanffy 3种非线性生长模型进行生长曲线拟合。结果表明:3种模型均能较好地拟合崇明白山羊体重和体尺的生长曲线(R~2>0.97),其中VonBertalanffy模型的拟合效果最好(R~2>0.99),但在0～2月龄的拟合效果较差,3种模型估计的公羊拐点月龄均迟于母羊;各月龄公羊体重、体高和体长均高于同期母羊,羔羊的日增重和相对生长率随着月龄的增加而逐渐下降。

Fitting and Analysis of Growth Curve for Chongming White Goats

To study the growth and development of Chongming white goats, the body weight, withers height, body length and chest circumference of 0～18 month-old Chongming white goats with different sex were measured. Their growth curves were fitted by three nonlinear growth models including Gompertz, Logistic and Von Bertalanffy. The results showed that all the three models could effectively fit the growth curves of body weight and body measurement of the goats(R~2>0.97), and the Von Bertalanffy model had the best fitting effects(R~2>0.99). However, the fitting effects were poor in 0～2 months old. The inflexion point age of rams was larger than that of ewes in the three models. The body weight, withers height and body length of rams at all ages were higher than those of ewes at the same period. The daily weight gain and relative growth rate of lambs decreased with the increase of the month.