An Unidentified Factor in Peanut Meal Required by the Chick

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Abstract
The addition of alcohol-extracted peanut meal to a purified chick diet containing purified casein as the source of protein resulted in a growth response which was only partially accounted for by its arginine content. The response also appeared not to involve any deficiency of known vitamins required by the chick. Under the conditions of this experiment, therefore, alcohol-extracted peanut meal supplied an unknown factor needed for chick growth which was lacking in the purified diet. The results also indicated that the chick's requirement for arginine is approximately 1.38% of a diet containing 23% protein. This confirms the work of Almquist and Merritt ('50), who found the arginine requirement to be approximately 6% of the total dietary protein.

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