TABLE 1

Differences in relative abundances of bacterial families present in ileal and cecal digesta of low- and high-RFI broiler chickens fed either ad libitum or restrictivelya

Family% Relative abundanceSEMP value
Ad libitum feedingRestrictive feeding
Low RFIHigh RFILow RFIHigh RFIFLRFIFL × RFI
Ileum
    o__Clostridiales;f__3.580.836.8311.274.2290.1120.8430.400
    f__Turicibacteraceae42.2048.2729.0627.858.6610.0580.7800.676
    f__Ruminococcaceae0.950.224.492.471.6420.0840.4080.695
    f__Enterobacteriaceae37.4922.8317.7411.147.1550.0330.1430.576
    f__Lactobacillaceae9.3822.1335.3433.309.0640.0460.5570.419
    f__Lachnospiraceae0.220.0630.760.490.2840.0960.4530.832
    f__Peptostreptococcaceae3.653.502.566.151.6990.6470.3160.277
    f__Clostridiaceae2.151.832.606.622.2470.2490.4140.339
    o__RF39;f__0.0230.0080.0600.0710.0330.1340.9490.700
    f__Christensenellaceae0.0500.00120.0910.0360.0390.3300.1850.934
    f__Bacillaceae0.0620.0180.0900.0440.0470.5600.3370.989
    o__Streptophyta;f__0.130.100.230.180.0860.2890.6650.912
    o__Clostridiales; Other0.0250.0280.0190.0330.0090.9420.3420.559
    f__Dehalobacteriaceae0.000400.0160.0050.0050.0540.2920.336
    f__Erysipelotrichaceae0.0050.0060.0070.0140.0040.2810.4190.436
    f__Coriobacteriaceae0.1130.1000.0900.0600.0190.1030.2580.673
    f__Enterococcaceae0.0370.0310.0270.0710.01810.3940.2980.172
    f__Corynebacteriaceae0.00060.0070.0030.0780.03510.2960.2520.329
Ceca
    o__Clostridiales;f__51.6751.8765.2966.093.217<0.0010.8760.926
    f__Turicibacteraceae0.350.970.120.0160.2280.0120.2630.119
    f__Ruminococcaceae29.0029.5423.3725.232.3580.0400.6140.781
    f__Enterobacteriaceae7.826.622.340.901.571<0.0010.4060.940
    f__Lactobacillaceae0.960.731.171.110.3260.3730.6620.798
    f__Lachnospiraceae7.947.655.244.160.9780.0030.4870.688
    f__Peptostreptococcaceae0.0620.0480.0220.0100.011<0.0010.1600.906
    f__Clostridiaceae0.180.410.040.060.1290.0590.3480.400
    o__RF39;f__0.610.901.000.690.1900.6480.9750.117
    f__Christensenellaceae0.520.170.650.490.1230.0790.0470.427
    f__Bacillaceae0.380.420.190.760.1790.6610.0950.142
    o__Streptophyta;f__0000.00080.00040.3390.3080.339
    o__Clostridiales; Other0.0720.1060.1040.0780.0310.9380.8870.343
    f__Dehalobacteriaceae0.0840.0790.1350.1360.0190.0070.9380.863
    f__Erysipelotrichaceae0.0860.1650.0720.0730.0330.1130.2260.243
    f__Coriobacteriaceae0.0050.0060.0070.0140.0040.2810.4190.436
    f__Enterococcaceae0.0050.0050.0020.0030.0030.0690.7530.615
    f__Corynebacteriaceae00.00000300.00060.00020.1500.1450.150
  • a Data are presented as least-squares means and pooled standard errors of the means (SEM). n =7 per FL group, residual-feed-intake (RFI) rank, and sex except for n =8 high-RFI ad libitum females. RFI was calculated for the experimental period from 9 to 30 days posthatch. FL, feed intake level.