3.4. Intestinal morphology
The jejunum morphological data, including villus height, crypt depth, and their ratios are presented in Table 5. K88 challenged piglets exhibited severe villous atrophy and decrease of villi-to-crypt ratio, but administration of CGMP had the trend to reduce the influence of K88 challenging on jejunum morphology (P > 0.05), which showed no significant differences with control group (P > 0.05).