Table 3.

Influence of the digestible lysine concentration and phytase on broiler performance¹ from hatch to 21 d posthatch (Exp. 1)

% of the digestible Lys requirement	Phytase, FTU/kg	Feed intake, g	BW gain, g	FCR, g:g
80	0	1,150	816	1.411
	750	1,133	824	1.376
	1,500	1,155	849	1.361
	3,000	1,162	848	1.370
88	0	1,205	911	1.324
	750	1,205	937	1.286
	1,500	1,190	914	1.302
	3,000	1,190	910	1.303
96	0	1,206	926	1.303
	750	1,220	960	1.272
	1,500	1,182	933	1.268
	3,000	1,210	953	1.269
104	0	1,206	913	1.321
	750	1,209	959	1.262
	1,500	1,218	957	1.274
	3,000	1,205	957	1.258
SEM		11	10	0.005
dgLys × phytase		0.1876	0.0689	0.0004
80% dgLys	Linear phytase			<0.0001
	Quadratic phytase			<0.0001
88% dgLys	Linear phytase			0.1105
	Quadratic phytase			0.0002
96% dgLys	Linear phytase			<0.0001
	Quadratic phytase			<0.0001
104% dgLys	Linear phytase			<0.0001
	Quadratic phytase			<0.0001
80		1,150	834	1.379
88		1,197	918	1.303
96		1,205	943	1.278
104		1,210	947	1.279
SEM		5	5	0.002
dgLys		<0.0001	<0.0001	<0.0001
Linear		<0.0001	<0.0001	<0.0001
Quadratic		0.0001	<0.0001	<0.0001
	0	1,192	891	1.340
	750	1,192	920	1.299
	1,500	1,186	913	1.301
	3,000	1,191	917	1.300
SEM		5	5	0.002
Phytase		0.8716	0.0002	<0.0001
Linear			0.0045	<0.0001
Quadratic			0.0147	<0.0001

¹Means represent the average response of 12 replicate pens/treatment and 33 birds/pen.