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Transfer of Vitamin A from Bovine Liver to Milk^{1, 2, 3,}

University of Kentucky, Lexington 40506

Abstract

The contributions of liver stores and the diet to the vitamin A contents of colostrum and milk were studied in eight mature Angus cows with previously established stores of tritium-labeled vitamin A. Samples of liver, serum and milk were taken within 2 hr. after parturition and at intervals during the first 12 weeks of lactation. Total vitamin A and alcohol and ester forms of vitamin A were determined on these samples as well as the radioactivity associated with each fraction. Average results indicated that liver stores furnished 36% of the vitamin A in colostrum and 55% of the vitamin A in milk. Most of the vitamin A activity and radioactivity in liver, colostrum and milk was present in the ester fraction. In serum, about 70% of the vitamin A activity and all of the radioactivity appeared in the alcohol fraction. Specific activities for vitamin A in colostrum and milk were consistently higher than for serum. The results indicate that vitamin A is removed from the liver as the alcohol and that the mammary gland is capable of transferring vitamin A alcohol from blood to milk in preference to vitamin A ester.

¹ The investigation reported in this paper (No. 74-5-12) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

² This investigation was supported in part by Public Health Service Research Grant No. HD 05449.

³ Appreciation is expressed to Hoffman-La Roche, Inc., Nutley, New Jersey who donated the radioactive vitamin A acetate.

⁴ Present address: Dairy Research Dept., Ralston Purina Co., Checkerboard Square, St. Louis, Mo. 63188.

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