Table 8.

Influence of the digestible lysine concentration and phytase on apparent ileal nonessential amino acid digestibility¹ of broilers at 21 d posthatch (Exp. 2)

% of the digestible Lys requirement	Phytase, FTU/kg	Asp,	Ser,‡	Glu,	Pro,	Gly,	Ala,	Cys,‡	Tyr,
		%	%	%	%	%	%	%	%
80	0	82.3	81.6	87.5	79.1	75.7	81.4	73.7	85.9
	750	86.9	86.0	90.4	84.1	80.4	85.1	78.2	88.1
	1,500	86.3	85.6	90.0	83.6	80.2	84.7	76.8	87.0
	3,000	84.6	84.0	88.4	81.8	77.3	82.2	74.9	85.9
88	0	83.6	83.0	87.8	80.5	77.6	81.4	71.9	85.4
	750	84.6	83.3	88.5	81.6	78.0	81.6	77.3	86.3
	1,500	87.4	86.3	90.1	83.9	80.9	85.4	77.3	87.9
	3,000	86.0	84.8	89.5	83.6	80.5	85.2	76.9	87.9
96	0	83.3	82.7	87.2	79.9	76.4	81.6	71.9	84.7
	750	84.3	83.7	89.0	82.8	77.6	82.7	76.7	87.4
	1,500	85.8	86.1	89.8	83.8	79.5	84.5	78.1	88.5
	3,000	86.0	84.8	89.6	83.8	79.9	84.2	77.9	87.7
104	0	84.4	83.2	88.4	81.8	77.6	83.0	73.7	86.5
	750	84.5	84.2	88.4	81.7	77.8	82.2	76.3	85.9
	1,500	83.5	83.2	88.1	81.0	76.3	81.8	75.4	83.7
	3,000	86.1	84.2	89.8	82.6	79.4	84.1	76.4	87.1
SEM		0.8	0.8	0.5	0.8	0.9	0.8	1.0	0.8
dgLys		0.5539	0.6240	0.7798	0.5242	0.1573	0.6671	0.7969	0.1206
Phytase		<0.001	0.0002	<0.001	<0.001	0.0004	0.0003	<0.001	0.0364
dgLys × phytase		0.0038	0.0783	0.0044	0.0116	0.0030	0.0007	0.2296	0.0023
80% dgLys	Linear phytase	0.0968		0.4330	0.0644	0.3059	0.6782		0.6520
	Quadratic phytase	0.0001		0.0001	0.0001	<0.001	0.0002		0.0413
88% dgLys	Linear phytase	0.0022		0.0025	0.0012	0.0028	<0.001		0.0097
	Quadratic phytase	0.1186		0.2013	0.4092	0.5861	0.7915		0.5521
96% dgLys	Linear phytase	0.0049		0.0007	0.0009	0.0021	0.0056		0.0047
	Quadratic phytase	0.6190		0.0503	0.0713	0.6669	0.3970		0.0275
104% dgLys	Linear phytase	0.3367		0.1238	0.7573	0.4604	0.4565		0.7201
	Quadratic phytase	0.1013		0.0907	0.2771	0.1023	0.0543		0.0114

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

^‡Quadratic main effect of phytase (P < 0.05).