约束选择指数的通径分析及决策分析

Path analysis and decision analysis of restricted selection index

建立了约束选择指数的通径分析化模型,分析其实质为约束选择指数的相关遗传力分解模型。进而运用通径分析的决策分析方法对约束选择指数进行决策分析,定义各性状对聚合遗传值的决策系数,各性状的决策系数代表其对聚合遗传值的综合决定作用。通过各性状的决策系数可以确定主选性状、限制性状和辅助性状, 使育种者在育种时,可直接选择个体的表型就能达到使复合育种值进展最大的目的。

Restricted selection index,restricted selection index was treated as comprehensive selection index with economic weight changed in Order to analyze its essence. The path analysis model of restricted selection index was established ,and the essence of the path analysis model of restricted selection index was correlated heritability analysis model between traits and aggregate genetic economic value. Furthermore, the decision analysis of restricted selection index was fulfilled by using decision analysis method of path analysis. Decision coefficient of every trait ,representing comprehensive effect of it on aggregate genetic economic value was defined. And primary selection trait together with auxiliary and restricted traits was deter mined by decision coefficient of every trait. Thus,the best selection strategy to maximize the aggregate genetic gain is found,and it allows breeders to select phenotypes directly.