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Shark Liver Oil and the Vitamin A Potency of Milk^*

Nutrition Laboratory and Dairy Division, Department of Animal Industry, Florida Agricultural Experiment Station, Gainesville, Florida

ABSTRACT

INTRODUCTION

The vitamin A activity of winter milk usually is lower than that of summer milk due to the reduced carotene intake of cows maintained on winter rations. It is well known that the vitamin A activity of milk is dependent on the level of carotene and vitamin A in the ration. The data presented herein are the result of an attempt to increase the vitamin A potency of winter milk.

REVIEW OF LITERATURE

Reports in the literature have shown that feeding carotene, whether as green pasture or hay in amounts as high as 6,000,000 International Units (I.U.) of vitamin A per cow per day, has never resulted in butter containingmore than 56 I.U. of vitamin A per gram, nor milk containing over 2500 units per quart (2, 18, 20, 21, 22).

Archibald and Parsons (1) fed a fortified cod-liver oil with the dairy ration and reported a significant increase in the vitamin A level of the milk from these animals as compared with those receiving unsupplementedrations.

^* Approved by the Director of the Florida Agricultural Experiment Station for publication, April 1942.