Table 2 Differences in bone geometrical characteristics of the hens laying eggs with different eggshell breaking strength^a

Humerus

 Length, cm

7.96 ± 0.25

7.93 ± 0.14

0.712

 Weight, g

3.13 ± 0.09

3.36 ± 0.54

0.234

 Volume, cm³

5.14 ± 0.71

5.21 ± 0.31

0.802

 Density, g/cm³

0.62 ± 0.09

0.64 ± 0.09

0.554

 Midpoint perimeter, cm

2.17 ± 0.14

2.08 ± 0.06

0.085

 Cortical cross-sectional area, mm²

9.08 ± 0.80

9.91 ± 1.20

0.079

 Mean relative wall thickness

0.18 ± 0.02

0.22 ± 0.07

0.061

 Mean cortical index

0.15 ± 0.02

0.18 ± 0.04

0.045

Femur

 Length, cm

8.65 ± 0.09

8.78 ± 0.06

0.204

 Weight, g

9.05 ± 0.27

9.11 ± 0.14

0.829

 Volume, cm³

7.16 ± 0.26

7.21 ± 0.12

0.875

 Density, g/cm³

1.27 ± 0.02

1.27 ± 0.02

0.976

 Midpoint perimeter, cm

2.61 ± 0.06

2.68 ± 0.03

0.313

 Cortical cross-sectional area, mm²

12.11 ± 2.25

13.99 ± 2.59

0.087

 Mean relative wall thickness

0.15 ± 0.03

0.18 ± 0.04

0.042

 Mean cortical index

0.13 ± 0.02

0.15 ± 0.02

0.047