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Activatability of Milk as Affected by Feeding Ergosterol to Cows

The Fleischmann Laboratories, New York, and Walker-Gordon Laboratory Co., Incorporated, Plainsboro, New Jersey

The direct addition of ergosterol to milk increased the activatability of the milk. Addition of 0.42 mg. of ergosterol per quart resulted in the milk attaining more than twice the antirachitic potency of normal milk when the two were given comparable exposures to ultraviolet light.

Feeding ergosterol (dissolved in oil or given in yeast) to cows did not result in an increased activatability of the milk on exposure of the milk to ultraviolet light. This result is in accord with reported chemical studies which indicate that plant sterols are not absorbed by mammals.