Fig. 3

Effects of usnic acid and tannic acid on intestinal immune function in broilers with NE. A VEGF and PDGF content in the intestinal mucosa. B Inflammatory factor content in the intestinal mucosa; C sIgA content in the intestinal mucosa; D Immune cell content in the intestines, analyzed by flow cytometry. a–cDifferent letters indicate significant differences (P < 0.05). PC: positive control group; SA: 500 mg/kg salinomycin group; UA: 300 mg/kg usnic acid group; UTA: 500 mg/kg tannic acid + 300 mg/kg usnic acid group. n = 5