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Chlorogenic acid improves antioxidant level of chickens. (A–C) Antioxidant activities analysis of serum samples in Control, TD and CGA groups on days 7, 10, 14 and 18. T-SOD represents the vitality of total superoxide dismutase, MDA represents the concentration of malonic dialdehyde, and T-AOC represents the total antioxidant capacity. The data are expressed as means ±SD. * p < 0.05, ** p < 0.01.
