Action of the testosterone treated chicken testis on the regression of the Müllerian duct]

After administration of testosterone propionate to male chick embryos and chickens, their testis have an activity, on the retrogression of mullerian ducts, much more important than that observed in testis of normal subjects of the same age, activity measured by grafting testis fragments in undifferentiated female chick embryos. The results suggest that testosterone gives such an effect by inhibiting pituitary gonadotropins, peculiarly FSH.