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A study of the sexual behavior of the male offspring of guinea pigs treated with cyproterone acetate (CA) is presented. CA was administered in doses of 50 mg/kg body weight from Day 30 to Day 45 of pregnancy. 15 male offspring were reared and their sexual behavior was studied in 4 experiments. No signs of masculine sexual behavior were observed in 11 of the males (73%) and only 1 animal showed complete male sexual behavior. Indications of female sexual behavior were observed in the test animals when in the presence of normal males though no spontaneous lordosis reaciton occurred. CA males that were subsequently castrated and treated with 50 mcg of testosterone propionate showed reduced masculine sexual behavior compared with control animals. CA males treated with 3 mcg of estradiol benzoate and .2 mg of progesterone had significantly longer lordosis reaction than control animals had though the reactions were significantly shorter than those observed in ovariectomized females treated with estradiol benzoate and progesterone. The reason for the altered sexual behavior is most likely the inhibition of endogenous androgen activity by CA during the differentiation of the hypothalamic centers that influence behavior. The results are at variance with other studies which did not find any feminizaiion of sexual behavior.

INFLUENCE OF CYPROTERONE ACETATE DURING PREGNANCY ON THE SEXUAL BEHAVIOUR OF MALE GUINEA-PIGS