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选择指数的实质是各选择性状所引起的目标性状的相关遗传进展的分解。根据这个原理,可以把选择指数的制订和通径分析结合起来。
The essence of the selection index is the decomposition of the related genetic progress of the target traits caused by the selected traits. According to this principle, the selection index can be formulated and path analysis combined.