Abstract
WAR TIME conditions have made it necessary to find suitable substitutes for such feed ingredients as dried skim milk, meat and bone scraps, and to a certain extent corn. All of these were formerly common constituents of rations for poultry and other animals. Rations utilizing distillers’ dried solubles as a vitamin supplement have been devised for growing poultry. Preliminary physiological investigations were made of birds fed these rations in order to determine the effect of such diets on the development of the vital organs of the chick.4In the course of these preliminary experiments one group of White Plymouth Rock cockerels exhibited a marked enlargement of the thyroid glands. Histological examination showed a marked hyperplasia of the parenchyma with no storage of colloid. Investigation revealed that the birds had been fed a salt mixture containing plain NaCl and MnSO4. Some of the birds had been fed ground wheat as a .
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