圩猪体重非线性生长曲线拟合分析

The Drawing and Analysis of Nonlinear Growth Curve of Wei Pig with Body Weight

对圩猪进行了生长曲线拟合,自出生开始每30 d称1次体重,根据平均体重分别利用Logistic、Bertalanffy、Gompertz模型进行生长曲线拟合,结果显示Gompertz模型拟合度最高(R^2=0.999 7),其他两种模式也相对较高,均高于0.997;从极限体重(成熟体重)和最大日增重看,Gompertz模型的极限体重和最大日增重分别为174.94 kg和579.21 g,较符合圩猪的体重和日增重范围,因此,Gompertz模型最适合圩猪的生长发育过程,Gompertz方程为:W=174.94 exp[-4.23 exp(-0.006 t)],其拐点分别是(240.29 d,64.36 kg)。

The growth curve of the Wei pig with body weight was carried out. From birth to 360 d, the bodyweight of Wei pig was weighed every 30 days. The Logistic, Bertalanffy and Gompertz models were fitted withthe average body weight. The fitting degree of Gompertz model was highest （R2=0.999 7） in these 3 models. Thefitting degrees of other two models were also higher than 0.997. Limit weight （174.94 kg） and maximum dailygain （579.21 g） obtained by Gompertz model were accord with the reality of Wei pig. So, Gompertz model is mostsuitable for the growth and development process of Wei pig. The Gompertz equation is W=174.94 exp[-4.23 exp（-0.006 t）] and the inflection points were 240.29 d （day age of inflection point） and 64.36 kg （body weight at theday age of inflection point）.