Table 9.

Effect of increasing dosage of the novel E. coli phytase on total tract digestibility of energy and nutrients 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
ATTDb, %
Ash	57.20	62.29	67.02	66.43	66.36	67.89	65.27	1.34	<0.01	<0.01	<0.01	0.13
DM	88.20	88.33	87.83	87.96	87.14	88.77	88.96	0.42	0.03	0.09	0.02	0.74
EE	45.63	49.62	48.00	51.45	45.64	57.54	58.30	3.16	<0.01	<0.01	0.38	0.98
CF	52.29	45.80	43.22	46.88	41.16	49.62	53.49	3.23	0.03	0.25	< 0.01	0.35
CP	87.24	87.50	86.96	87.30	86.10	88.24	87.60	0.64	0.3	0.43	0.35	0.52
GE	87.33	87.47	86.04	86.62	85.53	87.50	87.61	0.49	<0.01	0.43	<0.01	0.36
Ca	59.94	71.74	78.67	80.96	82.51	80.98	79.06	2.08	<0.01	<0.01	<0.01	0.01
P	40.25	56.04	61.95	69.25	68.46	73.20	72.36	2.65	< 0.01	<0.01	<0.01	0.05
STTDc, %
Ca	67.92	79.73	86.65	88.94	90.49	88.96	87.05	2.08	<0.01	<0.01	<0.01	0.01
P	44.82	60.61	66.52	73.81	73.03	77.77	76.93	2.65	<0.01	<0.01	<0.01	0.05

^aFTU, phytase units.

^bATTD, apparent total tract digestibility; DM, EE, CF, CP, and GE represented dry matter, ether extract, crude fiber, crude protein and gross energy, respectively.

^cSTTD, standardized total tract digestibility.