Fig. 1

Effects of dietary ZnCA supplementation on intestinal morphology in piglets. All intestinal tissue samples were examined using H&E staining, and images were captured at a magnification of 40 × using an optical microscope. CON: basal diet + saline solution; NC: basal diet + ETEC K88 challenge; PC: basal diet + 2,500 mg/kg of Zn (ZnO) + ETEC K88 challenge; ZnCA: basal diet + 1,600 mg/kg of Zn (ZnCA) + ETEC K88 challenge