The comparative analysis of seasonal changes of testosterone at males of a veil polar fox is presented in the article. The sampling of biomaterial was carried out in LLC “Animal husbandry “Vyatka” (Kirov region). The blood serums of polar fox adult males and males of the current year birth (16 heads) were investigated. The technique of researches is based on the immunofermental analysis. As a result of researches it is revealed that in the first months of life males of a veil polar fox have low testosterone content in blood and only by August there is an increase in secretion of androgens; then by September concentration of testosterone under the influence of autumn season decreases. Then increase of testosterone concentration happens up to February. The testosterone concentration decreases in March. The testosterone concentration was at a low level at adult polar foxes during the summer and autumn periods, but it was higher the testosterone concentration at puppies in the same time. The rise of testosterone secretion reveals in November. The maximum testosterone level in blood was in February during active rutting. In March the testosterone concentration in blood decreased. The testosterone concentration at adult animals was higher the testosterone concentration at young growth in all terms of the studies.

Berezina Yu. A., Domskiy I. A., Koshurnikova M. A., Bespyatykh O. Yu.

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