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Antioxidant status of dairy cows supplemented prepartum with vitamin E and selenium


Antioxidant status of dairy cows supplemented prepartum with vitamin E and selenium



Journal of Dairy Science 77(10): 3087-3095



ISSN/ISBN: 0022-0302

PMID: 7836597

DOI: 10.3168/jds.s0022-0302(94)77251-9

Possible relationships among dietary antioxidants, oxidative status, and placental retention were investigated in periparturient dairy cows. During 6 wk prepartum, 16 cows each were given daily by capsule 1000 IU of vitamin E, 3 mg of Se, both vitamin E and Se, or neither (control). alpha-Tocopherol in serum and fast-acting antioxidants in plasma increased, but, in red blood cells, thiobarbituric acid-reactive substances decreased during the last 6 wk before parturition in cows given vitamin E. These measurements were unaffected by supplementation of Se. Cows that had retained placenta > or = 12 h had lower fast-acting antioxidants in plasma and glutathione peroxidase in red blood cells up to 2 wk before calving than did cows that shed fetal membranes in < 12 h. Results suggest that inadequate dietary antioxidants may increase oxidative stress, production of lipid peroxides, and incidence of retained fetal membranes in dairy cows.

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Accession: 030127833

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