Table 2.
Effect of dietary available phosphorus levels with or without supplementation of phytase on productive performance of laying hens

Parameters	% of AP without phytase			% of AP with phytase			SEM	P-value
Parameters	0.20	0.25	0.30	0.20	0.25	0.30	SEM	P-value
Egg production (%)
40~44 weeks	88.66	88.94	89.43	90.03	89.73	89.56	0.31	0.859
45~48 weeks	85.63	86.38	87.19	87.30	88.06	87.12	0.30	0.229
49~52 weeks	85.44	86.64	86.90	87.22	87.93	87.33	0.34	0.419
53~56 weeks	84.61^b	86.21^ab	86.66^a	87.18^a	87.86^a	86.88^a	0.30	0.023
57~60 weeks	83.19	84.64	84.86	86.10	86.97	84.89	0.40	0.095
40~60 weeks	85.51^c	86.56^bc	87.01^ab	87.59^ab	88.11^a	87.16^ab	0.23	0.013
Egg weight (g)
40~44 weeks	61.08	61.22	61.58	61.39	61.66	61.23	0.12	0.784
45~48 weeks	61.29	61.23	61.04	60.98	61.10	61.33	0.12	0.957
49~52 weeks	61.24	61.21	60.82	61.44	60.83	61.02	0.14	0.801
53~56 weeks	60.42	60.62	61.01	60.81	60.55	60.04	0.18	0.737
57~60 weeks	61.21	60.73	60.82	61.17	60.70	61.05	0.15	0.879
40~60 weeks	61.05	61.00	61.05	61.16	60.97	60.93	0.07	0.974
Egg mass (g/h/d)
40~44 weeks	54.16	54.44	55.06	55.26	55.32	54.84	0.22	0.632
45~48 weeks	52.48	52.89	53.22	53.30	53.80	53.43	0.20	0.538
49~52 weeks	52.32	53.03	52.85	53.58	53.49	53.28	0.22	0.635
53~56 weeks	51.11	52.26	52.87	53.01	53.19	52.16	0.23	0.081
57~60 weeks	50.93	51.40	51.61	52.66	52.79	51.81	0.23	0.130
40~60 weeks	52.20^b	52.80^ab	53.12^ab	53.56^a	53.72^a	53.10^ab	0.15	0.020
Feed intake (g/h/d)
40~44 weeks	111.40	111.83	111.43	111.09	111.74	111.48	0.17	0.877
45~48 weeks	112.12	112.79	113.19	112.53	113.20	112.20	0.33	0.911
49~52 weeks	112.86	115.09	114.18	114.56	113.75	115.68	0.60	0.844
53~56 weeks	113.47	114.55	114.35	113.80	114.64	113.52	0.37	0.919
57~60 weeks	113.78	113.49	113.41	114.98	114.03	114.46	0.29	0.652
40~60 weeks	112.72	113.55	113.31	113.39	113.47	113.47	0.16	0.744
Feed conversion ratio (g of feed consumed/g of egg mass)
40~44 weeks	2.06	2.05	2.02	2.01	2.02	2.03	0.01	0.546
45~48 weeks	2.14	2.13	2.13	2.11	2.10	2.10	0.01	0.843
49~52 weeks	2.16	2.17	2.16	2.14	2.13	2.17	0.01	0.951
53~56 weeks	2.22	2.19	2.16	2.15	2.16	2.18	0.01	0.278
57~60 weeks	2.23	2.21	2.19	2.18	2.16	2.21	0.01	0.320
40~60 weeks	2.16	2.15	2.14	2.12	2.11	2.13	0.01	0.135