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Effects of MLP supplementation on the IgA concentration in (A) trachea and (B) bronchoalveolar lavage fluid on the mRNA expression levels in (C) tracheas, (D) bronchi, and (E) lungs of NDV-vaccinated chicks. Data are presented as means ± SD (n ≥ 6); ∗P < 0.05, ∗∗P < 0.01. Abbreviations: BC, blank control; MLP, mulberry leaf polysaccharide; MLP-L, MLP at a dose of 2 mg; MLP-M, MLP at a dose of 4 mg; MLP-H, MLP at a dose of 8 mg; NDV, Newcastle disease virus; VC, vaccine control.
