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Mean (± SE) blood glutathione peroxidase activity in adult horses (n = 5 per group) receiving supplementary inorganic Se (0.3 ppm DM, as sodium selenite), organic Se (0.3 ppm DM, as Se yeast), or receiving no supplementary Se (< 0.05 ppm DM); * the mean of horses receiving supplementary Se is significantly different from the mean of the control group (P < 0.05).
