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Effects of chitosan oligosaccharides (COS) on the intestinal morphology in Sprague Dawley rats under heat stress. CON group, control group fed the basal diet; HS group, basal diet and heat stress; HSC group, basal diet with 200 mg/kg COS and heat stress; VH, villus height; CD, crypt depth. Hematoxylin and eosin staining with magnification ×100. Bars represent 50 µm.
