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The development of the intestinal morphological structure as observed in chicks from different groups (HE staining, 100×). (A–C) The duodenum in the non-injected, probiotic, and synbiotic groups on day 14; (D–F) the jejunum in the non-injected, probiotic, and synbiotic groups on day 14; (G–I) the ileum in the non-injected, probiotic, and synbiotic groups on day 21.
