Maintenance nutrition in the pigeon. Vitamin B3 concentrates

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Abstract
From a liver concentrate with vitamin B3 activity 2 fractions were obtained: (a) one adsorbed on fullers'' earth carrying with it flavin and (b) one present in the filtrate after treatment with this reagent, fraction B. The flavin fraction showed some weight restorative potency whereas fraction B given alone was without effect. Greatest activity was shown when the 2 fractions were given together. In addition to vitamin B1 the pigeon appears to require at least 2 other factors for maintenance nutrition. The relation of these results to the factors necessary for the nutrition of the chick is discussed.