Development of sociosexual approach behavior in male laboratory rats.

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Abstract
Approach behavior toward male and female incentives was studied in male laboratory rats during development from prepuberty to adulthood. Both incentives were approached, but the magnitude of the response changed with age. At 70 days of age, the typical adult approach response was evident: the female was contacted for the better part of a session and the male incentive was contacted very little. The time for the appearance of this contact response was not obviously influenced by prepuberal experience in intact males or by the presence of gonadal hormones in neonatally castrated males. The magnitude of the preference for the female appeared to be affected by such treatment.

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