Table 9.

Concentrations of pro-inflammatory cytokines and oxidative stress products in the jejunal mucosa of nursery pigs fed diets with increasing levels of xylanase

Item1	Xylanase, XU per kg feed					SEM	P-value
	0	220	440	880	1,760		Linear	Quad2	0 vs. Xyl3
IL-8, ng/mg of protein	0.70	0.61	0.54	0.64	0.72	0.11	0.404	0.138	0.314
TNF-α, pg/mg of protein	0.55	0.59	0.56	0.49	0.51	0.11	0.503	0.836	0.867
Protein carbonyl, nmol/mg of protein	2.29	1.86	1.92	1.82	1.95	0.20	0.329	0.059	0.017
MDA, nmol/mg of protein	0.99	0.97	0.87	0.58	0.60	0.30	0.045	0.390	0.223

IL-8, interleukin-8; TNFa, tumor necrosis factor-alpha; MDA, malondialdehyde.

Quadratic.

Xylanase (220 + 440 + 880 + 1,760 XU per kg feed).