Table 3.

Egg production performance of commercial layers into 2 phases from 23 to 31 wk and 32 to 40 wk.

Groups1	Egg production, %		Feed intake, g/bird		FCR
	23 to 31 wk	32 to 40 wk	23 to 31 wk	32 to 40 wk	23 to 31 wk	32 to 40 wk
Control	93.4	96.6a	100.8	106.6a	2.04	1.95a
T1	90.1	96.4a	99.9	106.7a	2.01	1.91a
T2	93.5	96.5a	102.2	108.4a	2.09	1.97a
T3	90.3	73.6b	102.1	96.7b	1.98	1.83b
T4	95.5	98.3a	105.7	108.1a	2.06	1.97a
SEM	0.94	1.598	0.87	0.899	0.016	0.017
P-value	0.318	0.001	0.296	0.001	0.191	0.045

FCR = feed conversion ratio; SEM = standard error of mean.

^a,b Different letters indicate significant difference within columns (P < 0.05).

¹Control = 0.33% non phytate phosphorus (NPP); T1 = 0.24% NPP + 250 FTU/kg laboratory produced phytase; T2 = 0.24% NPP + 250 FTU/kg commercial phytase; T3 = 0.16% NPP + 500 FTU/kg laboratory produced phytase; T4 = 0.16% NPP + 500 FTU/kg commercial phytase.