Table 10.

Effect of increasing dosage of the novel E. coli phytase on apparent ileal digestibility of amino acids in growing pigs fed corn-soybean meal-based diets

	Phytase inclusion levels, FTUa/kg								P-value
Items	0	250	500	750	1,000	1,500	2,000	SEM	Diet	Linear	Quadratic	Cubic
Indispensable amino acids
Arg	84.59	89.70	87.74	87.43	87.42	86.00	86.97	1.38	0.18	0.35	0.03	0.09
His	80.25	85.88	82.16	80.97	82.67	81.95	83.47	1.68	0.22	0.63	0.03	0.09
Ile	79.35	85.65	83.68	82.94	83.65	80.75	82.37	2.10	0.20	0.33	0.04	0.16
Leu	77.99	84.24	79.37	79.96	81.34	79.87	82.30	1.89	0.26	0.87	0.11	0.04
Lys	81.38	86.98	86.20	84.32	84.67	83.57	84.43	1.90	0.24	0.29	0.02	0.35
Met	77.28	83.31	80.30	79.95	81.15	77.10	78.95	2.68	0.39	0.73	0.13	0.20
Phe	77.44	83.85	80.35	80.19	81.36	77.25	82.26	2.06	0.17	0.74	0.09	0.11
Thr	69.88	78.03	74.97	74.24	74.93	71.99	73.58	2.97	0.37	0.46	0.07	0.17
Trp	63.82	74.74	71.18	71.33	70.58	69.34	72.14	2.48	0.07	0.11	0.02	0.04
Val	71.87	79.93	76.05	75.16	76.72	72.09	77.66	2.65	0.17	0.71	0.06	0.13
Dispensable amino acids
Ala	77.93	81.13	76.73	77.51	80.61	74.15	79.84	2.46	0.37	0.48	0.61	0.26
Asp	72.93	81.07	79.47	78.42	78.56	77.13	77.57	1.98	0.06	0.08	0.01	0.11
Cys	63.02	74.47	69.98	68.60	69.97	65.41	64.96	4.18	0.31	0.55	0.07	0.19
Glu	75.80	84.12	82.54	81.55	81.49	76.62	77.97	2.41	0.08	0.17	0.04	0.21
Gly	58.46	69.03	62.78	64.48	64.71	62.93	59.35	4.47	0.69	0.68	0.31	0.18
Pro	74.55	79.47	70.55	73.24	69.67	71.32	62.80	4.52	0.25	0.41	0.80	0.24
Ser	72.02	80.35	76.99	77.09	77.74	74.31	75.83	2.79	0.27	0.35	0.08	0.11
Tyr	78.82	85.23	83.43	82.47	83.28	79.38	81.46	2.47	0.22	0.37	0.06	0.24

^aFTU, phytase units.