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Table 1 Mean (standard deviation) of the analysed phenotypes in the population of 350 individuals and in the two extreme groups (10 individuals each) for RFI, denoted as HFE and LFE (high and low feed efficiency groups, respectively), and the significance (p-value) of differences between HFE and LFE groups

From: Integrating genome-wide co-association and gene expression to identify putative regulators and predictors of feed efficiency in pigs

Phenotype Mean (SD) N = 350 Mean HFE (N = 10) Mean LFE (N = 10) p-valuea
RFI (kg/day) 0.00 (0.17) − 0.30 0.26 < 10−11
FCR (kg feed/kg gain) 3.16 (0.31) 2.72 3.30 < 10−5
ADFI (kg/day) 2.81 (0.37) 2.31 3.06 < 10−4
ADG (kg/day) 0.89 (0.11) 0.85 0.93 n.s.
CW (kg) 94.8 (10.6) 89.0 98.6 < 10−1
KO (%) 74.8 (2.4) 73.4 76.6 < 10−1
BF (mm) 24.0 (4.9) 22.4 24.5 n.s.
Lean (%) 40.8 (4.5) 42.6 36.8 < 10−1
IMF (%) 5.23 (2.06) 4.83 7.68 < 10−2
  1. RFI, residual feed intake; FCR, feed conversion ratio; ADFI, average daily feed intake; ADG, average daily gain; BF, back fat thickness; CW, carcass weight; KO, killing out percentage; LEAN, lean percentage; IMF, intramuscular fat content; n.s., non-significant differences between groups
  2. aStudent t test of LS means for group effect