Vitamins a, e and selenium blood levels in the fat cow syndrome.

Blood plasma analyses for vitamins A, E and selenium were performed from calving to five weeks of lactation in 29 cows. Twelve of the 29 cows had fat cow syndrome. The healthy cows had significantly higher (P<0.01) plasma vitamin A (40 mug/dL) and vitamin E (5 mug/mL) levels than the cows with fat cow syndrome (29 mug vitamin A/dL and 3 mug vitamin E/mL). At parturition, vitamin A level in plasma was low (25 mug/dL) but increased progressively thereafter (up to 51 mug/dL) in healthy cows, whereas cows with fat cow syndrome had lower levels of vitamin A, bordering on deficiency. The possible role of vitamin E in the alleviation of fat cow syndrome by affecting oxidation-reduction reactions in the liver is discussed. Significant (P<0.01) difference was not observed in selenium blood plasma level (35 ng/mL) between the two groups of cows or in another random group of 12 cows clinically affected by fat cow syndrome.