Figure 1.

A 3 cm long segment of intestine was harvested from the mid-duodenum, mid-jejunum and mid-ileum of piglets at 10 d after weaning, and stored in 4% paraformaldehyde for routine morphological measurements. Fixed intestinal samples were prepared with standard paraffin embedding techniques, and hematoxylin and eosin stained slides were prepared. Then the villus height and crypt depth were observed in a 10×10 mirror field of view. A to C: the morphological structure of duodenum; D to F: the morphological structure of jejunum; G to I: the morphological structure of ileum. A, D, G: piglets received powder creep feed; B, E, H: piglets received hard pellet creep feed; C, F, I: piglets received soft pellet creep feed.