Table 5.

Relative abundance of jejunal mucosa-associated microbiota at the family level in nursery pigs fed diets with increasing levels of xylanase

Item	Xylanase, XU per kg feed					SEM	P-value
	0	220	440	880	1,760		Linear	Quad1	0 vs. Xyl2
Clostridiaceae	17.50	18.79	7.44	7.65	7.07	5.75	0.147	0.339	0.270
Prevotellaceae	10.18	4.39	10.20	17.51	14.24	7.80	0.223	0.506	0.802
Helicobacteraceae	9.24	17.91	8.59	13.53	10.87	11.14	0.942	0.862	0.738
Comamonadaceae	7.39	5.59	7.44	4.53	5.12	1.54	0.284	0.580	0.327
Veillonellaceae	4.44	1.66	3.53	3.42	1.93	1.59	0.321	0.896	0.159
Lactobacillaceae	4.24	3.21	4.22	1.08	1.44	1.97	0.239	0.653	0.435
Enterobacteriaceae	3.56	2.85	3.46	1.51	3.53	1.06	0.921	0.221	0.550
Pseudomonadaceae	3.09	3.62	8.23	3.41	8.12	1.83	0.109	0.947	0.191
Oxalobacteraceae	3.03	5.72	9.52	1.53	10.47	4.79	0.205	0.514	0.254
Microbacteriaceae	2.68	1.81	2.60	1.65	1.73	0.50	0.224	0.580	0.205
Halomonadaceae	2.58	0.02	0.08	0.04	0.03	1.14	0.298	0.244	0.058
Erysipelotrichaceae	2.34	5.69	0.61	7.13	1.18	3.57	0.780	0.395	0.728
Peptostreptococcaceae	2.29	1.68	0.48	1.49	2.01	0.88	0.886	0.273	0.385
Burkholderiaceae	1.79	1.47	1.99	1.03	1.89	0.34	0.142	0.622	0.348
Micrococcaceae	1.17	0.30	0.55	0.28	0.46	0.29	0.266	0.117	0.025
Sphingomonadaceae	1.57	1.67	2.57	1.40	2.12	0.46	0.612	0.989	0.451
Lachnospiraceae	1.41	0.98	1.73	1.63	1.44	0.74	0.754	0.565	0.948
Methylobacteriaceae	1.34	1.61	1.73	0.75	1.54	0.48	0.862	0.488	0.910
Moraxellaceae	1.22	1.52	2.45	2.37	0.62	1.01	0.373	0.038	0.471
Campylobacteraceae	1.19	0.80	0.75	2.47	0.44	0.77	0.774	0.156	0.923
Propionibacteriaceae	1.19	1.68	2.31	2.45	1.48	0.85	0.887	0.111	0.283
Eubacteriaceae	1.10	1.46	1.12	1.14	0.56	0.67	0.307	0.646	0.964
Succinivibrionaceae	1.04	0.73	0.81	3.63	2.44	1.00	0.096	0.277	0.424
Xanthomonadaceae	0.94	2.29	3.74	0.60	3.85	1.48	0.235	0.656	0.197
Caulobacteraceae	0.70	0.78	0.40	0.34	0.91	0.49	0.666	0.175	0.782
Ruminococcaceae	0.68	1.11	1.04	1.10	1.33	0.62	0.401	0.808	0.374
Porphyromonadaceae	0.64	0.34	0.97	1.12	0.65	0.38	0.630	0.113	0.667
Pasteurellaceae	0.32	0.45	0.29	4.21	0.67	1.83	0.645	0.208	0.603
Streptococcaceae	0.29	0.84	0.99	0.71	0.28	0.35	0.460	0.121	0.238
Bacillaceae	0.12	1.82	0.35	0.22	0.21	0.73	0.502	0.943	0.507
Others	10.70	7.18	9.78	10.05	12.06	3.56	0.414	0.669	0.758

Quadratic.

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