Vitamin A Content of the Yolk of Eggs as Related to Rate of Production

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Excerpt from The Vitamin a Content of the Yolk of Eggs as Related to Rate of ProductionPal-er (9) in 1915 studied xanthephyll. The important yellow pigment in egg yolk. Reporting that 'the natural pigment characterizing the egg yolk, body fat, and blood serum of the hen is physiologically identical with.the caretin and xanthophyll pigments of plants, sith.the latter class of pigments present in by far the greater proportion Feeding tests with laying hens in thich the pigment of the food was carotin to the relative exclusion of xanthophyll were without appreciable influence upon the amount of pigment carried by the blood serum and deposited in the egg yolk. The feeding of rations relatively free from both carotin and xenthophyll to laying hens resulted in a marked reduction of the amount of this pigment carried by the blood serum and deposited in the egg yolk.