[Dynamics of the sex hormone and progesterone level in the peripheral blood and their production by the gonads and adrenals in postnatal ontogeny in silver foxes].

The newborn males of silver-black foxes are characterized by the high specific production of testosterone by the testes and its relatively high level in the blood. These indices sharply decreased by the end of the first month of life and then increased, this increase being most expressed during the prepuberate period. The suprarenals do not play any important role in the production of sex hormones in males. The newborn females are characterized by the high provision of the organism with oestradiol and progesterone produced by the gonads and suprarenals. The production of hormones decreased by the end of the first month of life and then increased in the prepubertate period.