Fig. 1

Intestinal morphological structure in broilers. A, B The morphological structure of jejunum; C The goblet cell count; D The morphological structure of jejunum, which was observed at 40 × magnification; E Distribution of goblet cells (purple cells with the black arrow) in the jejunum, which were observed at 200 × magnification; NC, normal stocking density fed basal diet; PC, high stocking density fed basal diets; OA, high stocking density fed basal diets supplemented with organic acids. ^a−bValues at the same index with no common superscripts differ significantly (P < 0.05)