The Requirement of Unidentified Factors for Mink

Abstract

Mink kits and adults fed highly purified rations supplemented with all the known crystalline vitamins require additional unidentified factors for normal nutrition. The characteristic deficiency symptoms are described. Preliminary evidence from the fractionation of the unidentified factors in fresh raw liver indicates that methanol extraction removes 1 factor(s) and that the insoluble residue contains another factor(s).