SEASONAL VARIATIONS IN PRODUCTION IN VITRO OF CORTICOSTEROIDS BY THE FROG (RANA RUGULOSA) ADRENAL

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Abstract
SUMMARY: Cyclical changes in the activity of adrenocortical tissue are a wellestablished phenomenon in many amphibian species but up to now they have been studied by observing changes in cytology or enzyme activity, e.g. steroid-3β-ol dehydrogenase. The present study was designed to provide a measure of corticosteroid secretion throughout the seasons using the in-vitro approach. Concomitant histological changes are also recorded and together provide evidence that the adrenal tissue of Rana rugulosa shows maximum activity in the spring spawning season and reaches a minimum in winter.

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