[Effects of testosterone and progesterone on the regression of Mullerian ducts induced by estradiol in the female chick embryo].

An administration of testosterone or of progesterone to estradiol-treated female chick embryos increased the rate of those presenting a regression of their Müllerian ducts. This observation favoured the hypothesis according to which the regression induced by estrogens depends on the anti-Müllerian hormone of ovarian origin.