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Rarefaction curves of Chao1 and Observed species indices for each sample of duodenal (A), jejunal (B), and ileal (C) contents. CD, CJ, and CI represent the intestinal content samples collected from the duodenum, jejunum, and ileum of the control ducks, respectively, and HD, HJ, and HI represent the duodenal, jejunal, and ileal content samples from the heat-treated ducks, respectively.
