Abstract
IT IS well known that the administration of thyroid substance induces molting in the hen in any season of the year (1, 2, 3). Some investigators reported that histological examination revealed an activation of thyroidal function during the natural molting period in several species of birds (4, 5) or in pre-molting period (6). These findings have naturally led to the supposition that molting is initiated by an increased activity of the thyroid gland. Sulman and Perek (7) showed, however, that thiouracil feeding precipitated molting in the hen. Shaffner (8, 9) reported that the administration of a large amount of progesterone induced unseasonable molt not via the thyroid in the hen. Furthermore, Tanabe et al. (10) reported no appreciable increase in the uptake of radioiodine by the thyroid was observed in molting hen compared with laying hen. These results throw much doubt on the dependence of molt on the thyroid.
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