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

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 *