Abstract
THE objective of most experiments on altering thyroidal activity of poultry has been to study the effect on growth rate and degree of fattening. Whether or not thyroprotein or goitrogens are ever used to any extent commercially will be largely dependent upon their effects on the over-all efficiency of the bird. Since feed efficiency is markedly affected by changes in the metabolic rate of the bird, this study measures the metabolic response of chickens to thyroprotein and the effect of high and low efficiency diets on this response.Recently Blaxter, Reineke, Crampton, and Petersen (1949) have presented an excellent review on the role of thyroidal materials and of synthetic goitrogens in animal production. A further review at this time seems unnecessary.The action of thyroprotein in elevating the metabolic rate seems to be well established; however, the effect of the caloric level of the diet on the response to thyroprotein .
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