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Effects of dietary chitosan oligosaccharides (COS) and Clostridium butyricum synbiotic supplementation on intestinal morphology of duodenum, jejunum, and ileum in early-weaned pigeon squabs. Sections were stained with H&E. C group, control group, squabs fed with artificial crop milk; CO group, squabs fed with artificial crop milk + 150 mg/kg COS; CB1, CB2, and CB3 group, squabs fed with artificial crop milk + 150 mg/kg COS + 200, 300, and 400 mg/kg C. butyricum, respectively.
