波尔山羊及其级进杂交后代生长模型研究

采用常用的Logisitic模型和Compertz模型分别拟合了纯种波尔山羊以及波尔山羊与当地的唐山奶山关照 要交一代、级进杂交二代（波尔山羊与杂交一代母羊回交）、级进杂交三代山羊初生至7月龄的生长发育规律，结果表明两种模型的拟合度（R^2）均达到0.96以上，其中Compertz模型的拟合优度均高于Logisitic模型。用Compertz模型参数估计了各种类型公母羊的最大体质量、拐点体质量、拐点日龄、最大日增体质量和瞬时相对生长率。结果表明：各类羊在早期生长较快；不同类型的相应公母羊间的生长发育存在较大的差异，且不同类型羊也存在一定差异；级进杂交二代公母羊和杂交三代母羊的表现和纯种波尔山羊基本相当。

Study on Growth Model of Boer Goat and the Gradingup Generations

The growth models during 0 to 7 months were investigated using Logisitic and Compertz model for Boer goat, the first,second and third gradingup generation of Tangshan milk goat with Boer goat, The results showed that fitness ( R 2) of the two models was above 0.96, and the Compertz model had higher R 2 value than Logisitic model. The parameters of maximum body weight, inflection age,body weight at inflection age, maximum daily gain, and maximum growth rate estimated with Compertz model showed that all goats grew fast at early age, and the growth rate between male and female within different types was considerably different. Meanwhile, the difference was also existed among different types. Male and female goats of the second gradingup generation or the female ewes of the third gradingup generation had similar performance with Boer goat.