Table 2.

Effects of phytase supplementation on performance of laying hens during 73–80 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
Egg production (%)
73–76 wk	72.25	72.89	73.14	73.32	74.11	73.51	0.21	0.17
77–80 wk	70.12	70.59	70.52	71.18	71.74	71.56	0.20	0.12
73–80 wk	71.18c	71.74bc	71.83abc	72.25abc	72.92a	72.53ab	0.17	0.04
Egg weight (g)
73–76 wk	64.31	64.13	63.94	64.26	63.88	64.13	0.11	0.86
77–80 wk	64.38	64.17	63.83	64.11	64.04	64.23	0.10	0.78
73–80 wk	64.35	64.15	63.88	64.19	63.96	64.18	0.07	0.56
Egg mass (g/h/d)
73–76 wk	46.46	46.74	46.76	47.12	47.34	47.14	0.13	0.41
77–80 wk	45.14	45.29	45.01	45.63	45.94	45.96	0.13	0.15
73–80 wk	45.81	46.02	45.88	46.37	46.64	46.55	0.12	0.16
Feed intake (g/h/d)
73–76 wk	115.29	115.25	115.58	115.90	116.06	115.18	0.15	0.49
77–80 wk	116.37	116.42	115.96	115.52	115.30	116.26	0.21	0.59
73–80 wk	115.83	115.84	115.77	115.71	115.68	115.72	0.06	0.96
Feed conversion ratio (g of feed consumed/g of egg mass)
73–76 wk	2.48	2.46	2.47	2.46	2.45	2.44	0.01	0.80
77–80 wk	2.57	2.57	2.58	2.53	2.51	2.53	0.01	0.15
73–80 wk	2.52	2.57	2.58	2.53	2.51	2.51	0.01	0.15

^a–cValues 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.