Table 2.

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

HS	Egg weight (g)	Shape index	Albumen height (mm)	Shell weight (g)	Yolk weight (g)	Haugh unit	Breaking strength (kg)	Yolk color	Egg quantity
CC	45.50b	1.32	4.08b	6.00	15.00A	64.79b	38.93	10.68	32.78B
FF	46.33a	1.31	4.37a	5.98	14.60B	68.33a	40.38	10.46	49.06A
SEM	0.296	0.003	0.098	0.047	0.110	1.027	0.660	0.084	0.852
Age
32 wk	42.70C	1.31	4.22B	5.69C,c	12.51D	67.55B,a,b	41.82A,a	10.17B,C,b	35.26B
41 wk	43.73C	1.32	3.92B	6.12A,B,a	14.52C	63.76B	39.37a,b	10.13C	50.36A
49 wk	47.53B	1.31	4.05B	5.92B,C,b	15.70B	64.93b	37.75B,b	11.40A	49.32A
57 wk	49.70A	1.33	4.73A	6.23A,a	16.45A	69.99A,a	39.69a,b	10.58B,a	28.75B
SEM	0.419	0.005	0.138	0.066	0.156	1.452	0.934	0.119	1.098
HS	0.050	NS	0.034	NS	0.009	0.016	NS	NS	<0.001
Age	<0.001	NS	<0.001	<0.001	<0.001	0.013	0.024	<0.001	<0.001
HS × age	0.004	NS	<0.001	NS	NS	0.001	NS	<0.001	0.016

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

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