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Biol Bull 136: 347-354. (June 1969)
© 1969 Marine Biological Laboratory
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SEASONAL CHANGES IN THE THYROID GLAND IN THE MALE COBRA, NAJA NAJA L

K. W. CHIU 1, J. G. PHILLIPS 2, and P. F. A. MADERSON 3

1 Department of Biology, The Catholic University of America, Washington, D. C. 20017
2 Department of Zoology, University of Hull, Yorkshire, England
3 Department of Biology, Brooklyn College of the City University of New York, Brooklyn, New York 11210

1. Variations in the weight and follicular cell-height of the thyroid gland of the male cobra (Naja naja L.) have been studied for 12 consecutive months during a one year period.

2. Changes in the weight of the gland were not correlated with follicular cell height.

3. The epithelial height was greatest during May and October-November, lowest in August.

4. Variations in the thyroid gland activity that are associated with epidermal sloughing are not great enough to alter the overall pattern of seasonal variation.

5. It is suggested that the annual cyclic changes in the thyroid gland activity are probably related to the general activity of the male animal throughout the year and are not associated with fluctuations in environmental temperature nor, as in the female, with any specific aspect of the reproductive cycle.






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Copyright © 1969 by the Marine Biological Laboratory.