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Effect of Dietary Fat and Vitamin E on -Tocopherol in Milk from Dairy Cows¹

Department of Animal Sciences, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44691

Corresponding author: W. P. Weiss; e-mail: weiss.6{at}osu.edu.

Diets with different fat treatments and with 25, 125, or 250 IU of supplemental vitamin E (all-rac -tocopheryl acetate)/kg of dry matter (DM) were fed for 28 d to midlactation Holstein cows to determine factors affecting concentrations of -tocopherol in milk. Diets contained no supplemental fat or 2.25% added fat from roasted soybeans or tallow. Vitamin E treatment had no effects on production, but fat supplementation increased milk yield (37.2 vs. 35.1 kg/d). Cows fed RSB ate more DM (24.0 vs. 21.9 kg/d) and produced more milk fat than cows fed tallow. Supplemental fat increased plasma concentrations of -tocopherol and cholesterol. Increased intake of -tocopherol linearly increased concentrations of -tocopherol in plasma but the rate of increase was 1.9 times greater when fat was fed. Plasma -tocopherol concentrations were linearly related to concentrations in milk, but a change in plasma -tocopherol resulted in a smaller change in milk -tocopherol when fat was fed than when it was not. Fat treatment did not affect plasma -tocopherol expressed relative to plasma cholesterol (mg -tocopherol/g cholesterol) or relationships between plasma -tocopherol/g of cholesterol and milk -tocopherol. These data suggest that concentrations of -tocopherol in milk are a function of the -tocopherol enrichment of the plasma lipid fraction and enrichment of that fraction is saturable.

Key Words: vitamin E • tallow • roasted soybeans • trans-fatty acids

Abbreviation key: PUFA = polyunsaturated fatty acids, RSB = roasted soybeans

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