Effect of supplementing periparturient cows with vitamin E on distribution of alpha-tocopherol in blood

J Dairy Sci. 1992 Dec;75(12):3479-85. doi: 10.3168/jds.S0022-0302(92)78124-7.

Abstract

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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Cattle / blood*
  • Cholesterol / blood
  • Colostrum / metabolism
  • Diet
  • Erythrocytes / metabolism
  • Female
  • Injections, Subcutaneous
  • Neutrophils / metabolism
  • Pregnancy
  • Vitamin E / administration & dosage*
  • Vitamin E / blood*

Substances

  • Vitamin E
  • Cholesterol