Table 3. Effects of dietary protease on ileal morphology of weaned pigs¹⁾

Item	Dietary treatments			SEM	p-value2)
	PC	NC	PR		Diet	PC vs. NC	PC vs. PR	NC vs. PR
Villus height (μm)	312.52	282.70	318.23	11.69	0.110	0.097	0.736	0.053
Crypt depth (μm)	102.32	99.15	88.48	5.37	0.204	0.684	0.094	0.186
VH : CD	3.11	2.87	3.67	0.24	0.099	0.507	0.130	0.040
Villus width (μm)	101.72	93.59	98.82	4.23	0.414	0.200	0.649	0.391
Villus area (μm2)	24,938	23,536	23,815	2,064	0.880	0.640	0.707	0.925

Each value is the mean of 5 replicates (5 pigs/pen).
Diet, main diet effect; PC vs. NC, effect between positive and negative controls; PC vs. PR, effect between positive control and negative control + 0.02% dietary protease; NC vs. PR, effect between negative control and negative control + 0.02% dietary protease.
PC, positive control with required level of protein; NC, negative control with low level of protein; PR, negative control + 0.02% dietary protease; VH, villus height; CD, crypt depth; SEM, standard error of means.