Abstract
Summary
Development and secretion of mammary parenchyma is normally demonstrable in male rats beginning at puberty. Castration prevents the proliferation of the mammary gland in the immature male, just as it does in the female. In adult males, in which the mammary gland is already developed, castration is followed by involution of the gland. Testosterone in doses sufficient to produce mammary gland development does not cause vaginal cornification either in the normal or the ovariectomized immature female rat.∗
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