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Effects of total dietary fiber on the relative mRNA expression of cecal barrier function genes of White Pekin Ducks on day 35. a,bMeans with different superscripts in the same index differ significantly (n = 6, P < 0.05). 12.4% TDF, 12.4% total dietary fiber; 14.7% TDF, 14.7% total dietary fiber; 16.2% TDF, 16.2% total dietary fiber; Muc2, Mucin-2; ZO-1, Zonula occludens-1.
