title: Role of antioxidants and trace elements in health and immunity of transition dairy cows.
abstract: A number of antioxidants and trace minerals have important roles in immune function and may affect health in transition dairy cows. Vitamin E and beta-carotene are important cellular antioxidants. Selenium (Se) is involved in the antioxidant system via its role in the enzyme glutathione peroxidase. Inadequate dietary vitamin E or Se decreases neutrophil function during the perpariturient period. Supplementation of vitamin E and/or Se has reduced the incidence of mastitis and retained placenta, and reduced duration of clinical symptoms of mastitis in some experiments. Research has indicated that beta-carotene supplementation may enhance immunity and reduce the incidence of retained placenta and metritis in dairy cows. Marginal copper deficiency resulted in reduced neutrophil killing and decreased interferon production by mononuclear cells. Copper supplementation of a diet marginal in copper reduced the peak clinical response during experimental Escherichia coli mastitis. Limited research indicated that chromium supplementation during the transition period may increase immunity and reduce the incidence of retained placenta.
authors.affiliation: Department of Animal Science and Interdepartmental Nutrition Program, North Carolina State University, Raleigh, NC 27695-7621, USA. Jerry_Spears@ncsu.edu
authors.forename: Jerry W
authors.initials: JW
authors.lastname: Spears
authors.forename: William P
authors.initials: WP
authors.lastname: Weiss
mesh_terms: D000821:Animal Feed; D000827:Animal Welfare; D000818:Animals; D000975:Antioxidants / Q000008:administration & dosage*; D002417:Cattle / Q000276:immunology / Q000502:physiology*; D002418:Cattle Diseases / Q000276:immunology / Q000378:metabolism / Q000517:prevention & control; D005260:Female; D006304:Health Status; D007774:Lactation / Q000502:physiology*; D009751:Nutritional Requirements; D011247:Pregnancy; D011644:Puerperal Disorders / Q000276:immunology / Q000378:metabolism / Q000517:prevention & control / Q000662:veterinary; D014131:Trace Elements / Q000008:administration & dosage* / Q000276:immunology; D014810:Vitamin E / Q000008:administration & dosage / Q000276:immunology
chemical_list: D000975:Antioxidants; D014131:Trace Elements; D014810:Vitamin E