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Changes of three biochemical indexes in three different groups of weaned piglets. (a) The level of superoxide dismutase of weaned piglets’ serum in three groups. (b) The level of malondialdehyde in the serum of weaned piglets. (c) The level of glutathione peroxidase in the serum of weaned piglets. Repeated five times for each group (n = 5). (*, P < 0.05; **, P < 0.01).
