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. 2023 May 4;14:72. doi: 10.1186/s40104-023-00867-8

Fig. 1.

Fig. 1

Representative photomicrographs of the cross sections of the middle ileum from chickens at d 28. The NC group shows normal physiological features of the intestinal villi, whereas the PC group shows severe pathological changes in the villi structure. The PTA1–PTA4 groups show mild pathological changes. NC: no tannic acid treatment or NE infection; PC: NE infection + 0 mg/kg tannic acid; PTA1: NE infection + 250 mg/kg tannic acid; PTA2: NE infection + 500 mg/kg tannic acid; PTA3: NE infection + 750 mg/kg tannic acid; PTA4: NE infection + 1,000 mg/kg tannic acid. The scale is 200 μm