Abstract
1. 1. The effects of pinealectomy on plasma T 3, T 4 and free T 4 concentrations were studied for about 10 weeks in pigeons maintained either under a constant short photophase or in a regime where a long photophase was replaced by a short one during the experiments. 2. 2. The results indicate that, regardless of the photoperiod, no clear functional relationship can be found between the avian pineal gland and thyroid function, although a transitory increase in T 4 levels was seen in both pinealectomized and sham-operated birds shortly after the operations.
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