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Mammary Transfer of Vitamin E in Cows Treated with Vitamin A or Linoleic Acid¹

Department of Animal Science, University of Kentucky, Lexington 40546

ABSTRACT

The effect of an intravenous injection of vitamin A alcohol and subcutaneous injections of linoleic acid on the mammary transfer of an intravenous injection of vitamin E acetate was studied with 15 Holstein cows. The cows received either an intravenous injection of 3 g vitamin E acetate (controls), intravenous injections of 3 g vitamin E acetate and 1 million IU vitamin A alcohol, or an intravenous injection of 3 g vitamin E acetate and subcutaneous injections totaling 40 g of linoleic acid. Milk samples were at 12-h intervals, two prior to and six following treatment. The main influence of vitamin A alcohol and linoleic acid on mammary transfer of vitamin E was to delay secretion of vitamin E in milk. However, total secretion of vitamin E was not reduced by injection of either vitamin A alcohol or linoleic acid. Vitamin E injection produced substantial increases in vitamin E in milk, but less than 1% of the dose could be accounted for in the milk.

¹ The investigation reported in this paper (No. 79-5-58) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with approval of the Director.

² University of Azarabadegan, Tabriz-Iran.