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Effect of dietary Quercetin (Q), Vitamin E (VE), and Q + VE on serum immunoglobulins of aging hens. The values are presented a mean ± standard deviation. Bars without the same letter differed significantly (P < 0.05). A–C represents serum IgA, IgM, and IgG, respectively. Abbreviations: IgA, immunoglobulin A; IgM, immunoglobulin M; IgG, immunoglobulin G.
