Vitamin A and carotene

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Abstract
The main reserves of vitamin A in the cow seem to be in the liver. The yellow pigment of butter fat is due to unchanged carotene. There are only small amounts of chromogenic material in the blood-fat and body-fat. Carrots, fed to a cow at the end of the winter stall-feeding period, increased the carotene and vitamin A content of the butter-fat. The degree of pigmentation depends upon the breed, Jerseys having twice as much as shorthorns. The vitamin A of the liver and other parts of the body may not be sufficient to meet the demands of prolonged lactation during the winter stall-feed period.