Table 3.

Relative abundance of jejunal mucosa-associated microbiota at the phylum and family level in nursery pigs fed diets with increasing levels of xylanase and β-glucanase combination (XG)^a

Item	XG, (TXU/TGU)/kg					SEMb	P value
	0	280/125	560/250	840/375	1,120/500		Linear	Quadratic
Phylum
Firmicutes	36.95	60.61	80.70	51.42	39.08	10.27	0.881	0.007
Proteobacteria	37.84	9.13	7.14	19.39	44.89	13.32	0.572	0.027
Actinobacteria	16.12	23.88	9.10	22.99	10.50	7.72	0.627	0.689
Bacteroidetes	7.72	0.91	2.14	1.40	4.14	2.11	0.336	0.048
Others	1.37	5.47	0.93	4.80	1.39	2.96	0.947	0.560
Family
Lactobacillaceae	14.91	29.01	50.09	27.69	14.99	11.87	0.975	0.043
Helicobacteraceae	36.09	4.49	6.40	17.01	43.67	12.54	0.497	0.018
Bifidobacteriaceae	13.42	19.40	5.99	19.59	7.93	6.67	0.616	0.745
Streptococcaceae	2.88	9.03	6.78	3.70	3.29	2.86	0.536	0.124
Erysipelotrichaceae	2.79	7.91	3.70	5.28	6.15	2.62	0.625	0.784
Lachnospiraceae	4.71	3.56	6.22	4.40	2.73	2.21	0.628	0.478
Veillonellaceae	4.13	3.95	4.18	4.49	4.22	1.46	0.880	0.986
Prevotellaceae	7.14	0.85	1.80	1.34	3.95	1.96	0.358	0.042
Ruminococcaceae	3.77	0.93	4.56	1.89	1.49	1.55	0.473	0.810
Coriobacteriaceae	2.38	2.46	2.22	2.96	2.07	1.21	0.973	0.836
Staphylococcaceae	0.09	0.71	0.33	0.04	4.52	2.13	0.128	0.221
Leuconostocaceae	0.24	1.86	0.08	0.57	1.22	0.86	0.767	0.907
Burkholderiaceae	0.50	0.66	0.05	1.54	0.08	0.72	0.989	0.681
Peptostreptococcaceae	0.73	0.49	1.21	0.17	0.18	0.38	0.253	0.384
Others	6.22	13.15	6.40	7.84	5.04	4.26	0.578	0.491

^aExperimental unit was a pig and level had 4 replicates (totaling 20 observations), representing the approximate median BW of each level

^bSEM Standard error of the means