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Using muscovy duck as male parent and Beijing duck as the female parent,the generation development and breeding effect of the progeny white-plumage mule duck were studied.The result showed that,through the selection in four generations,the A-B grade white plumage rate of the mule duck was improved from 19.55 % to 76.86 %,and the A-C grade from 61.55 % to 98.17 %.The average realized heritability in three generations was 0.6979.