BLUP法和主成分分析法在杜泊绵羊商业化品系建立中的应用研究

The Applicative Study of the BLUP and Principal Component Analysis in the Establishment of the Commercial Dorper Sheep Strains

本研究旨在为以一个初始杜泊绵羊群体为基础,建立适应多样化市场需求的商业化品系,提供可借鉴的实用方法。具体实施步骤包括:(1)用单性状动物模型BLUP法估计杜泊绵羊与品系划分有关性状的育种值;(2)利用主成分分析法,抽取所研究性状的可解释85%以上变异的主成分;(3)依据主成分值表达式的系数大小及符号,解释每个主成分的实际意义,确定各主成分可作为哪个品系的建立依据;(4)根据个体各标准化主成分值的大小及相应的分系标准,对杜泊绵羊群体进行商业化品系划分。本研究依据实际需求将现有杜泊羊群体划分为体长系、体宽系和肥羔系,其结果与依据性状估计育种值进行品系划分相似。在不考虑分系相关性状的经济权重时,BLUP法和主成分分析法适于初始群体的品系建立。

This study aimed to introduce a practical method used to establish commercial dorper sheep strains that could meet diverse market demand from an original population. The specific steps included. （1） Using single-trait animal model BLUP to estimate the breeding value of the traits related to establishing the strains （2） Using principal component analysis to extract com- ponent of the traits studied in the experiment which could explain over 85% variance （3） Explai- ning the practical meaning of the every component based on the coefficient in the expression of principal component value to determine each of the principal component may be used as the basis of which strains establishment; （4） Selecting individuals in dorper sheep population to establish strains according to their standardized principal component value and standards of the strains. According to practical demand, the existing dorper sheep population were divided into long car- cass, wide carcass and fat lamb strains in this experiment, and the results was similar with that of dividing strains based on estimated breeding value of the traits related to strains establishment. Without considering the economic weight of the traits, the BLUP and principal component analy- sis are applicated in the strains establishment from an original population.