Seasonal changes in the thyroid gland related to temperature and reproductive cycles have been observed in a number of reptiles. However, while the temperaturedependence of the thyroid has been well established, experimental studies aimed to demonstrate a direct association between reproductive events and thyroid secretions have so far been lacking (see reviews by Dodd & Matty, 1964; Lynn, 1970). We have now obtained data indicating that male hormone(s) may be of great importance in the maintenance of thyroidal function in lizards.
Indian garden lizards (Calotes versicolor) were housed in a temperature (31 ± 1 °C and photoperiod (12 h light) controlled chamber. Live maggots and water were provided ad libitum. In June, 15 adult males were castrated and 10 were sham-operated under sodium pentobarbitone anaesthesia. After 5 weeks each animal received i.p. 10 μCi carrier-free 131I in 0·2 ml 0·9% NaCl solution. Four to five animals from each group
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