Abstract
In the red fox, plasma thyroxine and testosterone levels show clearly marked seasonal variations. During winter (the breeding season) plasma testosterone concentrations are high while plasma thyroxine levels are low. In spring the thyroxine level rises at a high rate while testicular activity is decreasing. In autumn there is another peak in plasma thyroxine concentration and the plasma testosterone level remains low. The existence of these opposite relationships between the two cycles is considered in terms of possible thyroid-testicular negative interactions.
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