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A.O.A.C. chick units anti-rachitic basal biological birds fed calcification chemical compounds CHEMICALS DEPARTMENT WILMINGTON chick assay chicks fed chicks on diet chicks receive content of bones control group CORNELL UNIVERSITY D"-Activated Animal Sterol developed diet with Delsterol direct sunlight discovery dried bones DuPont Assay E. I. DU PONT edible powder effective Vitamin ELEMENT FOR POULTRY ESSENTIAL NUTRITIONAL ELEMENT exposure to direct extracted and dried factors fed Delsterol Group of chicks irradiated known as sterols Mash method nomic ORGANIC CHEMICALS DEPARTMENT PONT DE NEMOURS Pont laboratories Poor feathering potency of Delsterol poultry feeds poultry industry poultry nutrition poultry ration powder carrier pro-vitamin proportion of ash QUANTITY of Vitamin receiving no Vitamin rickets satisfactory egg scientific source of Vitamin tibia tion trade-mark for D"-Activated ultra-violet light unit of Vitamin units per Ib units per pound Vitamin D activity Vitamin D deficiency Vitamin D effect Vitamin D material Vitamin D supplement weak and unthrifty