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Variations in the Carotene Content of Farm Feeds

U. S. Department of Agriculture

Abstract

The main carotene in green leafy feeds, like grass, timothy or alfalfa, is the well-known pigment, beta-carotene, the same that is used as a standard in vitamin A work. Under suitable conditions it can probably be converted completely into vitamin A in the animal organism. The amount of it in these leafy feeds may be readily determined by routine methods; and equivalent amounts of carotene fed either in one of these feeds or as pure beta-carotene have the same vitamin A value. There is practically no other source of vitamin A in these feeds. Hence the determination of carotene in such feeds gives quickly, by a relatively inexpensive method, a definite and complete account of their potential value as a source of vitamin A. We have made determinations of this sort with Kentucky blue grass, green growing alfalfa, and various grades of hays.