Table 4 Differences in bone components of the hens laying eggs with different eggshell breaking strength^a

Humerus

 Fat-free dry weight, g

2.24 ± 0.12

2.53 ± 0.30

0.021

 Ash, g

1.39 ± 0.08

1.55 ± 0.17

0.022

 Ash content, %

62.07 ± 0.99

61.22 ± 1.66

0.203

 Organic matter, g

0.85 ± 0.05

0.98 ± 0.14

0.016

 Ca content in ash, %

36.75 ± 0.35

37.19 ± 0.57

0.137

 Total Ca per bone, mg

513.59 ± 17.49

586.49 ± 62.02

0.020

 P content in ash, %

16.28 ± 0.22

16.47 ± 0.31

0.249

 Total P per bone, mg

227.49 ± 7.77

259.75 ± 28.35

0.023

 Ratio of Ca and P

2.25 ± 0.01

2.26 ± 0.03

0.916

Femur

 Fat-free dry weight, g

5.32 ± 0.53

5.70 ± 0.52

0.099

 Ash, g

3.00 ± 0.35

3.40 ± 0.43

0.025

 Ash content, %

56.33 ± 3.17

59.45 ± 2.64

0.021

 Organic matter, g

2.32 ± 0.29

2.30 ± 0.14

0.848

 Ca content in ash, %

37.41 ± 0.37

36.63 ± 0.60

0.022

 Total Ca per bone, mg

1113.62 ± 94.55

1235.27 ± 137.7

0.105

 P content in ash, %

16.48 ± 0.17

16.07 ± 0.29

0.012

 Total P per bone, mg

490.46 ± 40.33

541.34 ± 54.71

0.097

 Ratio of Ca and P

2.27 ± 0.01

2.28 ± 0.03

0.509