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Determination of the mRNA expression levels of (A) Nrf2, (B) HO-1, and (C) SOD-1 in hen ovaries on days 40, 80, and 120. On bars, the same small superscript letters indicate no significant difference (P > 0.05); different small superscript letters indicate significant difference (P < 0.05). Abbreviations: Con, control; HELP, high-energy low-protein; RSV, resveratrol; SOD, superoxide dismutase.
