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PCoA analysis of β diversity in the cecum bacterial communities of Muscovy ducks in the C and CB groups at the indicated ages. C, control group; CB, C. butyricum group. 1d, 3d, 7d, 10d, and 14d represent 1st day, 3rd day, 7th day, 10th day, and 14th day of the present experiment, respectively.
