Table 5.

Relative abundance (% of total reads) of the most abundant bacterial families at the cecal mucosa of finishing pigs ranked on RFI^a–c

Familyd	LRFI	HRFI	SEM	P-valuee
Helicobacteraceae	33.28	31.49	6.322	0.832
Campylobacteraceae	27.57	18.16	4.681	0.057
Veillonellaceae	10.02	14.19	2.910	0.296
Lachnospiraceae	6.34	7.95	1.519	0.433
Prevotellaceae	5.04	5.82	1.400	0.677
Lactobacillaceae	2.31	4.05	0.939	0.184
Ruminococcaceae	3.40	3.44	0.607	0.957
Spirochaetaceae	1.73	3.74	2.202	0.498
Unclassified Clostridiales	1.53	1.85	0.522	0.643
YS2	2.19	1.72	0.884	0.693
Clostridiaceae	1.24	1.59	0.635	0.686
[Paraprevotellaceae]	0.39	0.057	0.799	0.819
Streptococcaceae	0.45	0.60	0.224	0.616
Succinivibrionaceae	0.49	0.52	0.161	0.894
Alcaligenaceae	0.31	0.45	0.126	0.407
Unclassified Bacteroidales	0.31	0.29	0.140	0.914
Unclassified Tremblayales	0.50	0.26	0.233	0.438
Unclassified RF32	0.17	0.23	0.084	0.606
Erysipelotrichaceae	0.14	0.19	0.049	0.467
Turicibacteraceae	0.15	0.19	0.054	0.631
[Methanomassiliicoccaceae]	0.128	0.069	0.076	0.563
S24-7	0.074	0.102	0.032	0.520
RF16	0.063	0.092	0.061	0.730
Peptostreptococcaceae	0.079	0.075	0.026	0.906
Verrucomicrobiaceae	0.009	0.113	0.117	0.512
RFP12	0.045	0.061	0.048	0.801
Coriobacteriaceae	0.054	0.069	0.019	0.530
Bacteroidaceae	0.010	0.063	0.031	0.216
Enterobacteriaceae	0.019	0.081	0.017	0.017
Peptococcaceae	0.028	0.048	0.011	0.186
Deferribacteraceae	0.099	0.032	0.038	0.203
Elusimicrobiaceae	0.036	0.017	0.031	0.634
Unclassified Clostridiales	0.040	0.034	0.011	0.692
Porphyromonadaceae	0.024	0.030	0.015	0.763
[Mogibacteriaceae]	0.023	0.029	0.008	0.593
Bacillaceae	0.009	0.031	0.020	0.405
Desulfovibrionaceae	0.022	0.022	0.008	0.955
Fibrobacteraceae	0.009	0.038	0.015	0.154
Fusobacteriaceae	0.013	0.025	0.009	0.342
Dethiosulfovibrionaceae	0.010	0.016	0.005	0.388
Sphaerochaetaceae	0.014	0.011	0.007	0.781
Anaeroplasmataceae	0.013	0.012	0.004	0.949
Unclassified Alphaproteobacteria	0.011	0.003	0.006	0.256

^aValues are least squares means ± SEM.

^bHRFI, high RFI; LRFI, low RFI.

^cResidual feed intake was determined between days 42 and 91 pw (n = 8/RFI rank).

^dRelative abundance presented amount to 98.4% and 97.9% of all reads at the cecal mucosa of LRFI and HRFI pigs, respectively.

^eMain effect of RFI rank.