Nonlinear equations to determine the growth curve of immunocastrated pigs

Abstract: The objective of this work was to compare the performance of the nonlinear Gompertz, logistic, and von Bertalanffy equations, to describe the growth curve of immunocastrated male pigs from birth until reaching 140 kg body weight. Standard error, number of iterations, mean square of the error, and coefficient of determination were compared between the models. The logistic and von Bertalanffy equations do not accurately estimate the initial and slaughter weights. The Gompertz equation shows the highest reliability and is, therefore, the most suitable one to describe the growth curve of immunocastrated pigs from birth until 140 kg body weight is reached.

摘要：本研究旨在对比非线性冈珀茨（Gompertz）模型、逻辑斯蒂（logistic）模型与冯·贝塔朗菲（von Bertalanffy）模型的拟合性能，以描述免疫去势公猪（immunocastrated male pigs）从出生至体重达到140kg时的生长曲线。研究对比了各模型的标准误、迭代次数、均方误差与决定系数。结果显示，逻辑斯蒂模型与冯·贝塔朗菲模型无法准确估算初始体重与屠宰体重；冈珀茨模型的可靠性最高，因此最适合用于描述免疫去势公猪从出生至体重达140kg的生长曲线。