DURING the past twenty years there has developed considerable interest in the relation of the secretions of the endocrine glands to growth and reproduction in domestic animals. Due to the fact that the hormone of the thyroid gland can be administered orally, poultry physiologists have given especial attention to the effect of the thyroid hormone upon feathering and egg laying in fowls. Crew and Huxley (1923) were unable to demonstrate an effect of thyroid feeding on egg production in two pens of six hens each during a period of four weeks starting in September. The egg weight was the same. In a later more extensive experiment Crew (1925) reported rather phenomenal results with thyroid in the rejuvenation of five cocks and seven hens five to eight years of age. To each of these birds desiccated thyroid was administered daily for six months (May to October). During the first two weeks . . .
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Turner et al. (1945) studied this question.