Table 4.

Effect of purple corn extract on egg quality in laying hen.

Items	PCE supplemental levels (mg/kg)				SEM	P- value
	0	120	240	360		Linear	Quadratic
90–93 weeks
Egg-shaped index	1.31	1.30	1.31	1.32	0.02	0.454	0.688
Eggshell strength, kgf/cm2	42.83	41.14	38.49	38.21	2.63	0.116	0.281
Eggshell thickness, mm	0.27	0.25	0.29	0.27	0.01	0.197	0.378
Yolk weight, g	17.36	17.55	16.91	17.35	0.34	0.646	0.835
Albumen height, mm	4.03	4.16	4.11	4.41	0.21	0.243	0.471
Yolk color	6.92	7.92	7.82	7.33	0.40	0.525	0.144
Haugh unit	57.46	61.41	64.01	60.43	2.66	0.334	0.227
93–96 weeks
Egg-shaped index	1.36	1.36	1.33	1.32	0.01	0.083	0.094
Eggshell strength, kgf/cm2	48.27	43.06	42.64	44.36	2.82	0.293	0.231
Eggshell thickness, mm	0.33	0.29	0.29	0.30	0.01	0.053	0.029
Yolk weight, g	17.64	18.72	18.38	17.59	0.39	0.770	0.135
Albumen height, mm	3.76	4.20	3.76	3.88	0.18	0.905	0.663
Yolk color	6.33	6.64	6.18	7.67	0.44	0.077	0.086
Haugh unit	58.72	62.61	57.78	59.00	1.52	0.534	0.535
96–99 weeks
Egg-shaped index	1.33	1.31	1.30	1.31	0.01	0.192	0.183
Eggshell strength, kgf/cm2	45.71	42.73	48.31	42.61	1.90	0.643	0.674
Eggshell thickness, mm	0.18	0.25	0.28	0.29	0.01	0.000	0.000
Yolk weight, g	17.30	18.46	18.29	18.01	0.43	0.310	0.142
Albumen height, mm	4.06	4.92	3.93	4.44	0.26	0.901	0.812
Yolk color	6.00	5.75	6.42	6.17	0.48	0.583	0.583
Haugh unit	57.64	68.31	54.40	64.25	3.44	0.724	0.935
Mean
Egg-shaped index	1.33	1.32	1.31	1.32	0.01	0.187	0.330
Eggshell strength, kgf/cm2	45.68	42.38	42.68	41.90	1.46	0.071	0.154
Eggshell thickness, mm	0.26	0.26	0.29	0.29	0.01	0.002	0.009
Yolk weight, g	17.43	18.22	17.82	17.64	0.23	0.794	0.072
Albumen height, mm	3.95	4.44	3.93	4.24	0.13	0.513	0.657
Yolk color	6.42	6.77	6.79	7.06	0.27	0.106	0.267
Haugh unit	57.89	64.25	58.65	61.29	1.59	0.527	0.417

SEM, standard error of mean.