Table 6.

Influence of the digestible lysine concentration and phytase on broiler performance¹ from hatch to 21 d posthatch (Exp. 2)

% of the digestible Lys requirement	Phytase, FTU/kg	Feed intake, g	BW gain, g	FCR, g:g
80	0	1,104	763	1.447
	750	1,137	818	1.390
	1,500	1,140	824	1.384
	3,000	1,155	835	1.384
88	0	1,184	837	1.413
	750	1,192	876	1.360
	1,500	1,116	816	1.368
	3,000	1,166	858	1.360
96	0	1,167	852	1.371
	750	1,188	908	1.310
	1,500	1,196	918	1.303
	3,000	1,169	885	1.322
104	0	1,176	855	1.376
	750	1,195	915	1.306
	1,500	1,165	884	1.317
	3,000	1,206	919	1.313
SEM		21	16	0.005
dgLys × phytase		0.2728	0.0975	0.1877
80		1,134	810	1.401
88		1,165	847	1.375
96		1,180	890	1.326
104		1,185	893	1.328
SEM		10	8	0.003
dgLys		0.0027	<0.0001	<0.0001
Linear		0.0004	<0.0001	<0.0001
Quadratic		0.2311	0.0304	<0.0001
	0	1,158	827	1.402
	750	1,178	879	1.341
	1,500	1,154	860	1.343
	3,000	1,174	874	1.345
SEM		10	8	0.003
Phytase		0.2782	<0.0001	<0.0001
Linear			0.0026	<0.0001
Quadratic			0.0140	<0.0001

¹Means represent the average response of 8 replicate pens/treatment and 25 birds/pen.