Abstract
Female hamsters which received treatment with testosterone, testosterone propionate, or diethylstilbestrol on Days 2–4 of postnatal life displayed mounting behavior after treatment in adulthood with testosterone propionate. Virtually no mounting was observed in animals treated neonatally with androsterone or control substances. Peripheral morphology was masculinized by androsterone, testosterone, and testosterone propionate but not by diethylstilbestrol or control substances. These results are consistent with the hypothesis that development of male sexual behavior is dependent upon the presence of estrogen or androgen which can be metabolized to estrogen during sexual differentiation. Dissociation of the effects of neonatal treatment upon behavior from those upon peripheral morphology suggests that the induction of masculine behavior results from a central neural hormone action.
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