milk yield trait 产奶量性状 ; 产奶性状
yield-related trait 产量相关性状
yield component trait 产量结构特点
trait of yield component 产量成分
Special attention should be given to the decrease of the additive variance of yield trait, and this will most possibly make genetic background narrow.
值得注意的是，产量性状的加性方差有降低的趋势，遗传基础可能变窄。
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