Table 4.

Ileal nutrient digestibility of broilers fed diets adequate or deficient in aP and Ca, with zero, 500, or 1,500 FTU/kg phytase, for 21 days.

		Ileal digestibility coefficients
		DM	N	P	Ca
		Simple effect means
Negative control (NC)		0.537	0.513	0.417	0.466
NC + 500 FTU/kg		0.626	0.623	0.524	0.464
NC + 1,500 FTU/kg		0.590	0.586	0.410	0.295
Positive control (PC)		0.583	0.589	0.431	0.397
PC + 500 FTU/kg		0.569	0.569	0.371	0.287
PC + 1,500 FTU/kg		0.572	0.562	0.418	0.242
SEM		0.012	0.018	0.032	0.033
		Main effect means
aP, %	0.35	0.584	0.574	0.450	0.408
	0.50	0.574	0.573	0.407	0.309
SEM		0.007	0.010	0.019	0.019
Phytase1	0	0.560	0.551	0.424	0.431
	500	0.598	0.596	0.478	0.376
	1,500	0.581	0.574	0.414	0.269
SEM		0.009	0.013	0.023	0.033
		P-values for main effects
aP, %		0.328	0.956	0.107	<0.001
Phytase		0.016	0.058	0.560	<0.001
aP × phytase		<0.001	0.003	0.022	0.131
		P-values for orthogonal contrasts
Phytase linear					<0.001
Phytase quadratic					0.824
PC linear		0.598	0.311	0.972
NC linear		0.032	0.036	0.504
NC quadratic		<0.001	<0.001	0.010

¹FTU/kg phytase.

8 replications per diet.

N: Nitrogen.

P: Phosphorus.

Ca: Calcium.