Table 7.

Intestinal morphology and crypt cell proliferation of nursery pigs fed diets with increasing levels of xylanase and β-glucanase combination (XG)

Item	XG, (TXU/TGU)/kg					SEMb	P value
	0	280/125	560/250a	840/375	1,120/500		Linear	Quadratic
Mid-jejunum
Villus height, µm	492	553	525	515	535	26	0.572	0.530
Crypt depth, µm	214	220	208	198	232	11	0.692	0.166
VH:CDc	2.33	2.53	2.59	2.65	2.32	0.15	0.827	0.085
Ki-67+d, %	32.2	31.9	34.5	30.9	30.1	1.21	0.195	0.138

^aAn observation of pigs fed a diet with 560/250 (TXU/TGU)/kg was removed from the data set for the final analysis as the observation confirmed as an outlier; experimental unit was a pig and each level had 8 replicates (totaling 40 observations)

^bSEM Standard error of the means

^cVH:CD Villus height to crypt depth ratio

^dRatio of Ki-67 positive cell to total cell in the crypt, which represents crypt cell proliferation