The Riboflavin Content of Cow's Milk

Abstract

The riboflavin content of about 400 samples of milk was determined by the measurement of the intensity of fluorescence of an acetone filtrate by a photoelectric cell. The riboflavin ranged from .60 to 3.42 mg. per liter. A negative skew correlation of −0.830 was found between riboflavin content and milk production. Commercial milk in summer contained about 20 per cent more riboflavin than winter milk. Cows, after being fed in winter on phosphoric acid grass silage, showed no increase in riboflavin when turned out on grass pasture. © 1939, American Dairy Science Association. All rights reserved.