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Mammary Transfer of Vitamin E in Dairy Cows¹

Animal Research Centre, Ottawa, Ontario, Canada K1A 0C6

ABSTRACT

Milk vitamin E from eight dairy cows was analyzed for vitamin E by HPLC during the 1st mo of lactation. Colostrum gave a mean value of 1.9 µg -tocopherol/ml while concentrations of fresh milk averaged .3 µg -tocopherol/ml. D--tocopherol concentrations were observed in very small amounts. When six cows at the end of the 1st mo of lactation were injected intraperitoneally with an emulsion of dl--tocopherol acetate (5 g), plasma and milk concentrations of -tocopherol were increased from their original values of 4.5 µ-g/ml plasma and .3 µg/ml fresh milk to 10.9 µg/ml plasma and 1.6 µg/ml fresh milk, 12 h later. The results show that intraperitoneal administration of vitamin E to dairy cows in an effective way of increasing plasma and milk tocopherol concentration.

¹ Contribution Number 1551 Animal Research Centre.

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