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Studies on Unidentified Chick Growth Factors Apparently Organic in Nature

Department of Poultry Husbandry and Graduate School of Nutrition, Cornell University, Ithaca, N. Y.

Further evidence has been obtained of the presence, in crude materials, of unidentified substances, apparently organic in nature, which stimulate growth of chicks fed a purified diet containing soybean protein and adequate quantities of all known vitamins. One of these, found in liver extract, appeared to replace zinc to a great extent or to render it more available. Another factor(s), present in a mixture of distillers' dried solubles, dried whey and fish solubles, promoted growth of chicks fed a purified diet adequate in zinc.