Table 3.

Effects of phytase supplementation on egg quality traits of laying hens at 76 and 80 wk of age.

Parameters	% of NPP without phytase			% of NPP with phytase			SEM	P value
	0.20	0.25	0.30	0.20	0.25	0.30
Shell color score
76 wk	25.38	25.06	25.56	25.69	26.81	25.13	0.34	0.71
80 wk	24.19	24.69	26.06	27.13	25.75	25.63	0.43	0.44
Albumen height (mm)
76 wk	5.81	5.78	5.79	6.013	6.40	5.86	0.10	0.46
80 wk	6.33	5.79	5.96	5.44	5.91	5.61	0.14	0.56
Haugh unit score
76 wk	73.14	73.25	72.53	74.18	76.46	72.88	0.78	0.74
80 wk	75.12	72.36	73.46	69.02	71.28	70.74	1.08	0.67
Yolk color score
76 wk	4.38	4.50	4.75	4.44	4.88	4.88	0.08	0.29
80 wk	6.19	5.81	6.25	6.13	6.31	6.13	0.07	0.46
Eggshell thickness (mm)
76 wk	0.372	0.373	0.383	0.387	0.392	0.394	0.003	0.160
80 wk	0.371b	0.371b	0.376ab	0.389ab	0.395a	0.396a	0.003	0.042

^a,bValues with different superscripts in the same row are significantly different (P < 0.05). SEM, standard error of the mean; Ronozyme HiPhos-L, 6-phytase produced by the strain of Aspergillus oryzae was used to supply 1,000 FTY per kg of feed.