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Effects of quercetin, vitamin E, and quercetin + vitamin E on the serum, liver, and ovary methane dicarboxylic aldehyde (MDA) level of aging breeder hens. Levels of methane dicarboxylic aldehyde (MDA) (A–C). The values are presented as the mean ± SD. Bars without the same letter differed significantly (p < 0.05). prot: protein.
