Abstract
Ten prepuberally castrated [female] rats were tested for masculine and feminine copulatory behavior before and after adm. of testosterone propionate. Prior to androgen treatment all animals exhibited incomplete masculine mating responses. After the inj. of testosterone propionate the masculine reactions of the [female][female] increased 95%, and their behavior included a greater proportion of complete copulatory responses. Although the 10 [female][female] were mounted by [male][male] 2811 times before hormone adm., no receptive behavior was exhibited. Following testosterone treatment lordosis appeared in 4 rats, and hopping and ear-wiggling were shown by 7 and 1 [female][female], respectively.