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Effects of MLP supplementation on the (A) MUC5AC and (B) MUC5B mRNA expression levels in the tracheal tissue of NDV-vaccinated chicks. Data are presented as means ± SD (n = 6); a, b, c: means with different letters differ significantly (P < 0.05). 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.
