[Histological studies on the hypothalamic adenohypophyseal-gonadal system after mestranol and chlormadinone acetate administration in fattening bulls].

Seventy-six young steers were examined to elucidate the action of the steroid oestrogen Mestranol and the gestagen chloromadinone acetate upon the morphology of hypothalamus, adenohypophysis, testes, and accessory sexual glands. The doses used were those applicable also to real animal husbandry. The mechanisms of action of the above pharmaceutical products are discussed against the background of the experimental results. No pathological alteration was observed that might prohibit application of the tested sexual steroids to young steers.