Table 6.

Effect of housing system, age, and their interaction on bone quality.

HS	Humerus weight (g)	Femur weight (g)	Tibia weight (g)	Humerus breaking strength (kg/kg)	Femur breaking strength (kg/kg)	Tibia breaking strength (kg/kg)
CC	3.52B	7.13	8.53	8.85B	13.11	13.67b
FF	4.49A	7.28	8.62	15.75A	15.42	16.76a
SEM	0.240	0.237	0.237	0.724	0.878	0.875
Age
32 wk	-	-	-	13.73	16.41a	17.41
41 wk	4.23	7.09	8.65	12.71	12.02b	13.95
49 wk	4.02	7.46	8.94	11.27	11.88b	13.10
57 wk	3.76	7.06	8.14	11.48	16.75a	16.39
SEM	0.294	0.290	0.291	1.024	1.242	1.238
HS	0.009	NS	NS	<0.001	NS	0.018
Age	NS	NS	NS	NS	0.008	NS
HS × age	NS	NS	NS	NS	NS	NS

Means within a column followed by different superscript letters differ significantly; NS: P > 0.05; ^A,BP < 0.01; ^a,bP < 0.05.

- = Data were not measured.

Abbreviations: CC, conventional cage; FF, flattening on floor; HS, housing system.