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Effects of quercetin, vitamin E, and quercetin + vitamin E on the antioxidant capacity of the liver, blood and ovary of aging breeder hens. Levels of total antioxidant capacity (T-AOC) (A–C), concentrations of glutathione (GSH) (D–F), glutathione peroxidase (GSH-Px) (G–I), catalase (CAT) (J–L), and total superoxide dismutase (T-SOD) (M–O). The values are presented as the mean ± SD. Bars without the same letter differed significantly (p < 0.05). prot: protein.
