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(a) Effect of Cu/ZnSO4, Cu/Zn–Mnt, and Cu/Zn–Thz on the intestinal morphology of weaned rabbits. (b) Morphometric analysis of villi length, lamina propria, villi width, and tunica muscularis diameter. The a, b, and c letters indicate significant differences between means at p < 0.05. Scale bar = 50 and 100 μm; rabbit/group, n = 5. Zn/CuSO4: zinc and copper sulfate; Zn/Cu–Mnt: zinc and copper in loaded montmorillonite; Zn/Cu–Thz: zinc and copper in hydrazone complexes.
