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Effects of FSE on concentration of intestinal mucosa sIgA in broilers. (A) (B) Concentration of sIgA in jejunum and ileum mucosal of broilers. Data are means ± SD. Bars with different letters are significantly different (P < 0.05). *P < 0.05, **P < 0.01 vs. the control group. CON group, basal diet; ZB group, basal diet + 30 mg/kg Zinc bacitracin; D-FSE group, basal diet + 50 mg/kg FSE; H-FSE group, basal diet + 100 mg/kg FSE, n = 6.
