一、前言 家畜有多种经济性状,选择方法有三:单项选择法、独立水平法和综合指数法。一般以综合指数法的效率最高。 综合指数法:假定家畜的综合经济育种值(记作H)是各项经济性状育种值(记作A_i)的线性函数,即:H+∑W_1A_1式中W_1f为i性状的经济权系数,亦称经济重要性。据此推导出估计H值的一般综合指数式为: I. Introduction There are a variety of economic traits of livestock, there are three options: single choice method, independent level method and the composite index method. Generally the most efficient method of composite index. Synthetic index method: Suppose that the comprehensive economic breeding value of livestock (denoted as H) is a linear function of the breeding value of each economic trait (denoted as A_i), that is: H + ΣW_1A_1 where W_1f is the economic power coefficient of i trait, also known as Economic importance. Based on this, we derive the general composite index of estimated H value as: