. 2015 Dec 18;16:1073. doi: 10.1186/s12864-015-2292-8

Table 1.

Summary of phenotypic traits. Mean of the groups of high feed efficiency (HFE, n = 20) and low feed efficiency (LFE, n = 20) and P-value of the difference between groups for phenotypic traits measured during the feeding trial and slaughter

Trait	HFE mean	LFE mean	P-value
BWi (kg) ^♦	403.10 ± 35.6	409.50 ± 23.0	0.50
BWf (kg)^○	542.10 ± 46.9	533.90 ± 25.2	0.47
DMI (kg/d) ^♦	9.99 ± 1.3	12.00 ± 0.7	1.03x10-6*
ADG (kg/d) ^♦	1.97 ± 0.5	1.76 ± 0.2	0.06
FCR ^♦	5.22 ± 0.8	6.90 ± 0.8	2.84x10-8*
RFI (kg/d) ^○	−1.14 ± 0.4	1.24 ± 0.5	6.79x10-8*
RWG (kg/d) ^♦	0.27 ± 0.3	−0.29 ± 0.2	3.00x10-9*
RIG ^○	1.40 ± 0.4	−1.53 ± 0.6	6.77x10-8*
REAi (cm²) ^♦	67.51 ± 5.5	65.95 ± 5.3	0.36
REAf (cm²) ^♦	83.49 ± 6.9	83.12 ± 6.0	0.85
REAg (cm²) ^♦	15.98 ± 8.9	17.18 ± 6.4	0.63
BFTi (mm) ^♦	1.18 ± 1.0	1.64 ± 1.2	0.19
BFTf (mm) ^♦	3.99 ± 1.9	5.78 ± 1.4	1.9x10 ⁻³ *
BFTg (mm) ^♦	2.81 ± 2.0	4.15 ± 1.4	0.02*
RFTi (mm) ^♦	2.78 ± 1.4	3.73 ± 1.9	0.08
RFTf (mm) ^♦	5.76 ± 2.4	8.19 ± 2.2	1.8x10 ⁻³ *
RFTg (mm) ^♦	2.99 ± 1.9	4.47 ± 1.6	0.01*
LW (kg) ^♦	6.00 ± 0.59	5.78 ± 0.54	0.48
CY (%)	60.11 ± 1.6	60.23 ± 1.6	0.83
PFW (kg) ^♦	4.44 ± 1.1	5.57 ± 1.3	5.9x10 ⁻³ *
KFW (kg) ^○	4.45 ± 1.1	5.63 ± 1.6	7.3x10 ⁻³ *

BWi, initial body weight; BWF, final body weight; DMI, dry matter intake; ADG, average daily gain; FCR, feed conversion ratio; RFI, residual feed intake; RWG, residual body weight gain; RIG, residual intake and body weight gain; REAi, initial rib eye area; REAf, final rib eye area; REAg, gain of rib eye area; BFTi, initial back fat thickness; BFTf, final back fat thickness; BFTg, gain of back fat thickness; RFTi, initial rump fat thickness; RFTf, final rump fat thickness; RFTg, gain of rump fat thickness; LW, liver weight; CY, carcass yield; PFW, pelvic fat weight; KFW, kidney fat weight

*P ≤ 0.05

^♦Student’s t-test

^○Mann–Whitney-Wilcoxon test