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Intestinal (duodenum, jejunum, and ileum) morphological structure in broilers on day 42. The pictures were observed at 100× magnification (n = 8). NC, negative control supplied with the basal diets; PC, positive control supplied with the basal diets and 5 mg/kg flavomycin; OA, the basal diets supplied with 0.3% (day 0–21) and 0.2% (day 22–42) organic acids feed additives.
