Table 6. Differences in the relative abundance (%) of bacterial genera in intestinal digesta and feces of low and high residual feed intake (RFI) male 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
Lactobacillus	16.78b	48.70ab	57.13a	34.36ab	13.658	0.740	0.348	0.054
Turicibacter	37.96a	7.51b	6.22b	28.58ab	9.499	0.673	0.578	0.009
Streptococcus	3.88	5.04	0.08	0.71	1.835	0.631	0.034	0.886
Klebsiella	1.88a	0.19b	0.05b	0.57ab	0.559	0.302	0.206	0.056
Methylobacterium	0.006	0.003	0.40	0.39	0.225	0.976	0.091	0.985
Pseudomonas	0	0	0.08	0.06	0.036	0.713	0.091	0.844
Ceca
Unclassified Clostridiales 1	45.62	59.38	60.66	63.48	3.878	0.040	0.019	0.168
Unclassified Ruminococcaceae	23.01a	15.99bA	9.66bB	10.59b	2.327	0.199	<0.001	0.097
Anaerotruncus	8.72	11.32	1.36	1.26	2.010	0.538	<0.001	0.506
Unclassified RF39	1.10	2.42	7.34	6.09	1.043	0.972	<0.001	0.226
Ruminococcus	2.83	1.47	4.28	3.57	0.460	0.031	<0.001	0.479
Faecalibacterium	0c	0c	2.29a	1.06b	0.313	0.120	<0.001	0.026
Bacillus	1.20	0.83	0.15	0.21	0.296	0.594	0.008	0.466
Streptococcus	1.05a	0.35b	0b	0b	0.165	0.024	<0.001	0.074
Unclassified Christensenellaceae	0.26	0.20	0.64	0.48	0.101	0.280	0.002	0.653
Coprococcus	0.24	0.16	0.17	0.12	0.032	0.050	0.131	0.626
Unclassified Clostridiales 2	0.24	0.17	0.11	0.12	0.031	0.358	0.006	0.190
Clostridium	0.03	0.04	0.006	0.03	0.009	0.142	0.076	0.361
Feces
Lactobacillus	10.09	16.10	7.39	28.56	7.918	0.096	0.542	0.346
Unclassified Ruminococcaceae	8.53	5.45	2.55	1.88	2.563	0.471	0.072	0.642
Acinetobacter	0.51b	4.51a	0.12b	0.12b	0.955	0.044	0.018	0.044
Unclassified RF39	0.45	0.10	3.60	0.51	0.873	0.058	0.051	0.130
Klebsiella	2.10	2.18	0.04	0.05	1.089	0.967	0.063	0.973
Unclassified Clostridiales 2	0.19	0.09	1.30	1.91	0.509	0.618	0.007	0.488
Unclassified Clostridiaceae 2	0.20b	0.05b	0.16b	1.11a	0.272	0.154	0.070	0.050
Faecalibacterium	0	0	0.74	0.61	0.300	0.967	0.046	0.704
Anaerotruncus	0.57	0.53	0.12	0.08	0.193	0.844	0.025	0.993
Unclassified Lachnospiraceae 1	0.42	0.12	0.41	0.23	0.131	0.078	0.700	0.668
Blautia	0.04	0.02	0.14	0.16	0.067	0.994	0.087	0.747
Dorea	0.04	0.02	0.07	0.02	0.017	0.026	0.277	0.527
Unclassified Peptostreptococcaceae	0	0	0.01	0.03	0.006	0.493	0.009	0.169

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).