Seasonal variations in thyroxine and testosterone levels in relation to the moult in the adult male mink (Mustela vison Peale and Beauvois)

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Abstract
Plasma thyroxine (T4) and testosterone concentrations were measured in adult male mink maintained outdoors under natural light and fed ad lib year round. Plasma T4 concentrations presented a biphasic seasonal change, the highest values occurring in the spring and autumn months and the lowest values in the winter months. The plasma testosterone cycle showed an annual maximum in Jan.-Feb. The possibility of testis-thyroid interactions is discussed. The changes observed are correlated with environmental temperature, photoperiod and molting cycle.