Abstract
1. Circadian rhythms of the T and DHT content in the plasma, characterized by a decrease in the morning and daytime hours to a minimum in the evening and a sharp increase in the concentration by night, were detected in sexually mature male rhesus monkeys. The circadian rhythm of the content of androstenedione was characterized by minimum values in the evening, an increase during the night, and a peak in the early morning. 2. Substantial differences were detected in the daily dynamics of the concentration of T and DHT, depending on the time of year and the conditions of the experiment. 3. Seasonal fluctuations of the content of T and DHT in the blood of rhesus monkeys were noted, with high values in the winter and a minimum in the summer.
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