Hormone-induced changes in the organization of sexual behavior in the male rat.

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Abstract
Male rats were given a single injection of estradiol benzoate, testosterone propionate, or oil approximately 96 hr. after birth. Compared to oil, testosterone had no permanent effect on growth or adult sexual behavior. Estrogen treatment suppressed growth and development of sexual behavior. There was an inverse relationship between amount of estrogen given and probability of mating in adulthood. On tests for sexual behavior after castration, estrogen-treated males required administration of more testosterone propionate for display of mounting than did oil- or testosterone-treated males, and their mounts were strikingly atypical, infrequently resulting in intromission or ejaculation. When males treated with estrogen in infancy were administered estrogen and progesterone in adulthood female like-lordosisresponse were elicted in some Ss.