. 2018 Apr 24;96(7):2804–2816. doi: 10.1093/jas/sky152

Table 4.

Effects of increasing concentrations of an E. coli phytase on the apparent ileal digestibility of DM, CP, and AA in corn-soybean meal–based diets fed to growing pigs, %

Item			Phytase, FTU¹ per kilogram complete feed				SEM	P-value²
Item	PC³	NC	500	1,000	2,000	4,000	SEM	PC vs. NC	Linear	Quadratic
DM	70.80	71.95	70.92	70.70	73.52	70.95	1.43	0.566	0.989	0.465
CP	77.41	77.31	76.41	76.16	79.04	76.53	1.13	0.952	0.914	0.357
Indispensable AA
Arg	89.85	90.35	89.99	89.84	90.88	89.89	0.44	0.443	0.861	0.439
His	83.58	85.28	83.28	82.83	84.89	82.49	0.77	0.121	0.115	0.881
Ile	81.93	82.35	82.31	82.12	84.21	82.62	0.79	0.700	0.484	0.196
Leu	83.51	84.08	84.12	84.02	85.79	84.29	0.72	0.571	0.540	0.162
Lys	81.26	80.74	80.17	78.95	82.25	79.59	1.20	0.758	0.865	0.471
Met	86.76	85.44	86.41	81.42	88.24	80.66	3.25	0.699	0.249	0.348
Phe	83.14	83.52	83.95	83.84	85.77	84.41	0.69	0.683	0.205	0.086
Thr	74.41	74.86	74.11	73.82	76.58	73.70	1.18	0.778	0.830	0.263
Trp	80.91	80.62	80.77	81.00	83.34	81.18	1.16	0.861	0.519	0.163
Val	78.74	79.58	79.26	78.59	81.21	79.02	1.00	0.543	0.943	0.324
Mean	82.73	82.87	82.84	82.31	84.62	82.56	0.83	0.895	0.877	0.185
Dispensable AA
Ala	78.86	79.40	78.18	78.36	80.85	78.53	1.19	0.752	0.937	0.399
Asp	79.86	78.88	79.12	78.72	82.04	79.06	0.92	0.457	0.543	0.054
Cys	74.23	75.69	71.80	69.65	74.05	73.98	2.48	0.673	0.826	0.391
Glu	84.76	83.91	83.17	82.16	87.12	83.78	1.22	0.624	0.482	0.225
Gly	64.67	63.31	60.05	61.52	66.81	63.64	2.88	0.740	0.480	0.581
Pro	82.10	80.67	81.94	78.24	81.45	80.60	1.92	0.599	0.977	0.873
Ser	83.29	83.85	83.70	83.75	85.46	83.81	0.87	0.601	0.703	0.173
Tyr	83.54	83.83	83.60	83.68	85.47	83.96	0.74	0.782	0.529	0.184
Mean	80.87	80.30	80.71	78.95	82.20	80.18	1.00	0.691	0.784	0.430
All AA	81.71	81.47	82.05	80.47	83.29	81.26	0.83	0.837	0.912	0.286

Data are means of 8 observations per treatment, except for the negative control diet that had only 6 observations, and diets containing 500 and 2,000 FTU of phytase only had 7 observations.

¹FTU = phytase units.

²Linear and quadratic contrasts of adding 500, 1,000, 2,000, or 4,000 FTU/kg phytase to the NC diet.

³PC = positive control; NC = negative control.