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Effects of dietary Se sources on morphology of jejunum in laying hens. The representative pictures (40 ×) of jejunum section with hematoxylin and erosion (H&E) staining. Ctrl, the birds fed the basal diet; Norm, the birds fed 0.3 mg/kg of Se provided by sodium selenite; SS, SEY, and SEIP, the birds fed 2 mg/kg of Se provided by sodium selenite, Se-enriched yeast, and Se-rich insect protein powder, respectively.
