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Journal of Dairy Science Vol. 75 No. 12 3479-3485
© 1992 by American Dairy Science Association ®
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Effect of Supplementing Periparturient Cows with Vitamin E on Distribution of alpha-Tocopherol in Blood

W. P. Weiss 1, J. S. Hogan 1, K. L. Smith 1, D. A. Todhunter 1, and S. N. Williams 1

1 Department of Dairy Science, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44691

Holstein cows were fed 0 or 1000 IU/d of supplemental vitamin E during the dry period and injected with placebo or 3000 IU of vitamin E at 10 and 5 d prior to anticipated calving. Blood was collected at various times, starting at 60 d prepartum (dry off) and concluding 30 d postpartum, and separated into plasma, red blood cells, and neutrophils. Oral supplementation increased concentrations of alpha-tocopherol in plasma and red blood cells on 10 d, but not on 5 d prepartum. Injection of vitamin E increased alpha-tocopherol in plasma, red blood cells, and neutrophils at d 5 prior to and on the day of parturition. Concentrations of alpha-tocopherol and cholesterol in plasma were correlated, and both were at their nadir at parturition. Concentrations of alpha-tocopherol in plasma and red blood cells were correlated, but the correlation increased when plasma alpha-tocopherol was expressed per unit of cholesterol. alpha-Tocopherol in plasma and neutrophils had a low correlation. Injection of alpha-tocopherol increased its concentration in plasma, red blood cells, and neutrophils during the periparturient period. Concentration of alpha-tocopherol in plasma of periparturient cows may be limited by its low lipid content, and transport mechanisms for alpha-tocopherol may differ between red blood cells and neutrophils.

Key Words: alpha-tocopherol • vitamin E • blood • cows

Submitted on June 8, 1992
Accepted on August 20, 1992




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Copyright © 1992 by the American Dairy Science Association ®.