No evidence that selection for egg production persistency causes loss of bone quality in laying hens

Table 4 Summary statistics for bone material properties collected using infrared spectroscopy, thermogravimetry, and X-ray diffraction on tibia cortical and medullary bone for the White Leghorn b and Rhode Island Red populations

Traits	n	Mean ± sem	n	Mean ± sem	n	Mean ± sem	n	Mean ± sem
	Cortical bone		Cortical bone		Medullary bone		Medullary bone
	White Leghorn		Rhode Island Red		White Leghorn		Rhode Island Red
Infrared spectroscopy measurements
PO₄/AmideI	956	3.316 ± 0.009	920	4.232 ± 0.019	961	1.193 ± 0.012	910	1.287 ± 0.017
CO₃ 1415/AmideI	956	0.951 ± 0.001	919	1.088 ± 0.002	962	0.406 ± 0.002	915	0.426 ± 0.004
MinCO₃ 1415	958	0.288 ± 0.001	922	0.260 ± 0.001	948	0.356 ± 0.002	920	0.353 ± 0.004
MinCO₃ 870	958	0.0252 ± 0.0001	920	0.0278 ± 0.0001	948	0.0464 ± 0.0007	914	0.0617 ± 0.0015
Thermogravimetric measurements
H₂O%	960	11.01 ± 0.04	914	9.57 ± 0.03	941	8.67 ± 0.05	782	8.10 ± 0.05
Organic%	930	23.75 ± 0.03	916	24.51 ± 0.05	962	54.64 ± 0.26	799	57.77 ± 0.39
Mineral%	956	65.24 ± 0.04	915	65.88 ± 0.05	959	36.52 ± 0.24	790	34.01 ± 0.3836
PO₄%	955	61.81.4 ± 0.04	910	62.67 ± 0.05	962	33.68 ± 0.23	792	31.53 ± 0.36
CO₃%	958	8.31 ± 0.05	902	3.18 ± 0.02	941	12.59 ± 0.02	780	2.46 ± 0.03
PO₄/Organic	953	2.607 ± 0.004	910	2.566 ± 0.007	961	0.647 ± 0.007	786	0.596 ± 0.011
CO₃/Mineral	956	3.42 ± 0.02	901	7.61 ± 0.04	946	2.80 ± 0.03	769	11.92 ± 0.14
X-ray diffraction measurements
FWHM_002 (deg)	954	0.435 ± 0.001	596	0.590 ± 0.002
FWHM_310 (deg)	955	0.856 ± 0.002	827	1.024 ± 0.003
AS_002	955	45.3 ± 0.1	885	51.0 ± 0.2
Oriented fraction	952	0.896 ± 0.004	890	0.514 ± 0.004

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