Abstract
AbstractSkin grafts were exchanged between Rouen Ducks to determine the influence of sex genotype and the modifications induced by the hormonal environment on the coloration of feathers. The skin of both sexes responded similarly to hormones of the female, but male plumages, both breeding and “eclipse,” were produced only when both skin genotype and endocrine environment were male. Female skin grafted on males produced feathers that were “feminized.” The results show that sex differences in the skin are present at hatching and maintained through succesive generations of feathers.
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