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[Comparative evaluation of secretion of testicular androgens and excretion of their metabolites in young and old dogs].

It was shown experimentally that in old dogs a sharp reduction of testosterone and androstendion secretion by the testes was accompanied by a marked reduction of their metabolites (androsterone and ethiocholanolone) excretion. In the presence of a general reduction of the testicular androgen secretion and their urinary metabolite excretion there was noted a relative prevalence of fractions with low activity: of androstendion over testosterone in the blood, and of ethiocholanolone over androsterone in the urine. As postulated, in aged dogs hormonal background was characterized not only by quantitative, but also by qualitative changes, prerequisites for the development of visceral and metabolic disturbances.