Table 4.

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

Item	LRFI	HRFI	SEM	P-valuesd
Eubacteria
Proteobacteria	52.95	63.71	8.636	0.360
Firmicutes	33.90	26.06	5.344	0.285
Bacteroidetes	8.19	4.59	1.647	0.123
Spirochaetes	1.27	3.59	2.389	0.471
Cyanobacteria	2.59	0.74	0.807	0.107
Verrucomicrobia	0.047	0.244	0.1629	0.373
Actinobacteria	0.071	0.037	0.0151	0.114
Deferribacteres	0.053	0.093	0.0391	0.444
Elusimicrobia	0.064	0.047	0.0276	0.650
Fibrobacteres	0.011	0.023	0.0161	0.567
Fusobacteria	0.026	0.010	0.0085	0.194
Tenericutes	0.025	0.011	0.0067	0.140
Synergistetes	0.016	0.012	0.0058	0.624
Archaea
Euryarchaeota	0.110	0.056	0.0829	0.631

^aValues are least squares means ± SEM.

^bHRFI, high RFI; LRFI, RFI.

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

^dMain effect of RFI rank.