Table 5. Differences in the relative abundance (%) of bacterial genera in intestinal digesta and feces of low and high residual feed intake (RFI) female broiler chickens raised at two geographical locations (L).

	L1d		L2d			P-Value
Genusc	Low RFI	High RFI	Low RFI	High RFI	SEM	RFI	L	RFI × L
Ileum
Turicibacter	55.37aA	24.78abB	9.32b	21.94abB	12.281	0.472	0.058	0.091
Escherichia/Hafnia/Shigella	15.91b	44.98a	35.49ab	14.85b	9.923	0.675	0.601	0.019
Lactobacillus	12.05	4.68	35.29	39.11	11.225	0.876	0.016	0.623
Streptococcus	0.69b	8.05a	0.46b	0.30b	1.548	0.029	0.016	0.023
Unclassified Clostridiaceae 2	0.16	0.31	0.80	1.08	0.364	0.551	0.064	0.864
Methylobacterium	0.004	0.01	1.22	0.65	0.509	0.584	0.081	0.573
Bacillus	0.006	0.02	0.46	0.16	0.173	0.412	0.096	0.371
Clostridium	0	0	0.07	0.06	0.021	0.849	0.020	0.503
Corynebacterium	0	0	0.02	0.07	0.016	0.059	0.025	0.169
Ceca
Unclassified Ruminococcaceae	21.46	19.20	18.73	10.59	3.238	0.123	0.094	0.377
Anaerotruncus	7.29	8.39	0.63	1.75	2.016	0.590	0.003	0.999
Unclassified RF39	1.60b	1.28b	2.25b	7.94a	0.911	0.007	<0.001	0.003
Ruminococcus	1.92	2.15	4.60	4.32	0.529	0.967	<0.001	0.633
Unclassified Lachnospiraceae 2	0.63	0.56	2.36	1.29	0.545	0.311	0.034	0.370
Faecalibacterium	0.21	0.18	0.84	1.82	0.339	0.180	0.003	0.152
Bacillus	0.47	0.61	0.08	0.39	0.176	0.216	0.096	0.636
Streptococcus	0.32	0.64	0	0	0.160	0.061	0.059	0.980
Unclassified Clostridiaceae 2	0.004	0.005	0.23	0.03	0.069	0.157	0.079	0.150
Clostridium	0.03	0.04	0.004	0.009	0.011	0.441	0.020	0.744
Feces
Turicibacter	7.99	3.39	17.16	32.19	7.653	0.503	0.020	0.212
Unclassified Clostridiales 1	18.18	12.73	4.11	0.89	5.337	0.426	0.022	0.837
Unclassified Ruminococcaceae	9.65	9.28	1.88	0.23	4.229	0.814	0.058	0.882
Streptococcus	4.12	5.88	0.45	1.29	1.853	0.491	0.035	0.807
Unclassified Clostridiales 2	0.15b	0.67b	6.57a	0.77b	1.817	0.159	0.085	0.094
Unclassified Clostridiaceae 2	0.09	0.17	2.79	1.30	0.514	0.185	<0.001	0.139
Ruminococcus	1.51	1.48	0.74	0.07	0.483	0.480	0.033	0.510
Acinetobacter	0.02b	1.74a	0.15b	0.12b	0.511	0.111	0.158	0.099
Oscillospira	0.82	0.76	0.29	0.04	0.272	0.566	0.028	0.731
Anaerotruncus	0.44	0.76	0.05	0.01	0.304	0.653	0.074	0.557
Unclassified Lachnospiraceae 2	0.28	0.19	0.41	0.02	0.124	0.060	0.883	0.243
Unclassified Peptostreptococcaceae	0.002	0.005	0.06	0.15	0.050	0.374	0.060	0.401
Pseudomonas	0.005b	0.004b	0.02a	0.003b	0.003	0.037	0.091	0.042

Data are presented as least-square means and pooled standard error of the mean (SEM).

^a,b Different superscript letters within a row indicate significant difference (P ≤ 0.05).

^A,B Different superscript capital letters within a row indicate a tendency (P ≤ 0.10).

^c The coverage of analyzed bacterial genera accounted for 99.02% of all sequences.

^d L1, University of Veterinary Medicine Vienna (Vienna, Austria); L2. Agri-Food and Biosciences Institute (Hillsborough, Northern Ireland, UK).