Table 1 Descriptive statistics of phenotypic data

Body size

Neck length (NL, cm)

20.3 ± 1.2

23.5

17.5

Fossil bone length (FBL, cm)

14.1 ± 0.7

16

12

Breast width (BrW, cm)

10.7 ± 0.5

12.6

9.3

Carcass yield

Dressed weight (DW, kg)

2.7 ± 0 .2

3.4

2.1

Dressed percentage (DP, %)

87.1 ± 1.8

92.6

83.2

Eviscerated weight (EW, kg)

2.3 ± 0.2

2.8

1.7

Eviscerated weight percentage (EWP, %)

73.4 ± 1.9

90.5

63.1

Half-eviscerated weight (HEW, kg)

2.4 ± 0.2

3.0

1.8

Percentage of half-eviscerated yield (HEWP, %)

77.9 ± 1.9

96.0

66.7

42-day body weight (BW42, kg)

3.1 ± 0.3

3.9

2.4

Internal organs

Heart weight (HW, g)

17 ± 2.8

28

9.5

Liver weight (LW, g)

69.5 ± 9.7

120.6

42.6

Cut

Foot weight (FW, g)

66 ± 7.3

91.6

45.5

Wing weight (WW, g)

111.7 ± 9.7

141.8

81

Breast muscle weight (BMW, g)

238.2 ± 36.8

399

134

Breast muscle weight percentage (BMWP, %)

10.5 ± 1.2

16.4

7.1

Leg muscle weight (LMW, kg)

234 ± 86.9

456

123

Leg muscle weight percentage (LMWP, %)

10.4 ± 3.8

37.3

11.7