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The small intestinal morphology structure of broilers at different ages. A, villous height; B, crypt depth; C, villous height:crypt depth. Lacking the same letters in the curves (a, b, c, d) means that the differences at P < 0.05 were observed among different ages for the same small intestinal segments. Lacking the same letters on the same day (A, B, C) means that the differences at P < 0.05 were observed among different small intestinal segments.
