Abstract
The administration of 0.3% of Enheptin (2-Amino, 5-Nitrothiazole) in the diet to the laying hens in each period of February and May June soon suppressed egg lay, but the drug had no effect on the release rate of I131 as thyroid hormone thyroid.Molting occurred only in Enheptin-fed hens which completed the preeding molt six months or more before.These results indicate that Enheption had no direct effect on the activation of feather papillae to induce molting, and it is concluded that natural molting in the hen is induced by the decrease in the ovarian activity, together with the senile deterioration of the structure in the feather follicle maintaing the old feathers after about six months from the preceding molting.
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