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Redox metabolites and antioxidant enzyme activities in plasma of laying ducks during the period of high temperature (days 1 and 21) and recovery (day 55). (A) The leve of malondialdehyde (MDA); (B) The activity of superoxide dismutase (SOD); (C) The level of glutathione (GSH); (D) The activity of GSH peroxidase (GSH-Px). Data are means ± SEM, n = 6 for each treatment at each time points. Different letters indicate significant difference at the 0.05 probability level.
