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-Tocopherol, and Zinc Concentration During the Periparturient Period: Effect of Milk Fever
1 USDA, Agricultural Research Service, National Animal Disease Center, Ames, IA 50010
Retinol (vitamin A), 
-tocopherol (vitamin E), and Zn are micronutrients essential for health and performance. We determined the effects of parturition, lactation, and periparturient Ca status on plasma retinol, -tocopherol, and Zn in 18 Jersey cows during the 2 wk before and after parturition. Six cows developed clinical milk fever. Prepartum plasma concentrations of retinol, -tocopherol, and Zn decreased progressively in all animals. A nadir was reached at 1 d postpartum when concentrations declined to 38, 47, and 67%, respectively, of prepartal baseline concentrations. Plasma Zn returned to baseline concentrations within 3 d of calving, and plasma -tocopherol returned toward baseline about 10 d after calving. Plasma retinol remained below baseline concentrations throughout the first 2 wk of lactation. The decline in plasma Zn observed at calving was more severe in cows with milk fever (parturient paresis) than in cows without milk fever. The decrease in plasma retinol and -tocopherol observed at parturition was similar in cows with or without milk fever. These data document an acute decline in plasma retinol, -tocopherol, and Zn in the immediate periparturient period and indicate that the decline in plasma Zn is more severe in cows with milk fever.
Key Words: -tocopherol • retinol • zinc
Submitted on January 19, 1990
Accepted on April 19, 1990
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