Abstract
Forty-eight spadefoot toads (24 of each sex) were acclimated at 15°C or 25°C for 5 days. During the period of acclimation, half of the animals at each temperature received daily injections of Na- l-thyroxine (0.2 μg/2 grams body weight); and the remainder of the toads received injections of the vehicle. At the end of the fifth day, oxygen consumption of liver tissue and of skeletal muscle was determined at the acclimation temperature by differential respirometry. Acclimation-test temperature had a pronounced effect on oxygen consumption of both liver tissue and skeletal muscle. Sex of the tissue donor had no influence on metabolic response of either liver or muscle. Whereas thyroxine injections elicited no calorigenic response from skeletal muscle, the hormone treatment caused a depression of metabolism of liver at 15°C and stimulated metabolism at 25°C. Thus, these findings provide additional support, albeit conditional, for the concept that the thyroid glands of adult Anura exercise some control of oxidative metabolism.
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