Table 6.

Effects of dietary protease supplementation on standardized ileal digestibility (%) of the protein and amino acids of soybean meal fed to growing-finishing pigs (50 to 65 kg/140 d old), phase II

Item	Protease inclusion, g/ton				SEM	P-value
	0	25	50	75		Linear	Quadratic	CON vs. protease1
CP	78.2	80.9	82.5	77.4	2.6	0.84	0.37	0.72
Indispensable AA
Arg	84.9	89.5	87.9	84.9	2.25	0.89	0.13	0.28
His	83.7	85.8	85.2	82.2	1.63	0.52	0.16	0.70
Ile	80.7	82.2	83.3	79.0	1.45	0.58	0.08	0.64
Leu	79.4	81.2	83.6	78.7	1.43	0.97	0.04	0.29
Lys	76.0	78.3	79.1	75.8	1.94	0.98	0.20	0.40
Met	82.7	85.0	85.9	81.2	1.68	0.64	0.07	0.54
Met + Cys	73.7	77.0	78.7	71.9	1.95	0.71	0.02	0.36
Phe	80.6	82.4	81.5	79.5	1.45	0.55	0.24	0.75
Thr	75.6	78.2	78.2	75.9	1.98	0.95	0.31	0.50
Trp	83.5	84.0	87.8	84.8	1.65	0.31	0.29	0.30
Val	75.6	77.5	79.0	72.6	1.67	0.36	0.03	0.69
Mean	80.2	82.3	83.1	79.4	1.49	0.69	0.06	0.43
Dispensable AA
Ala	57.3	62.1	60.5	56.4	2.93	0.77	0.18	0.41
Asp	77.8	79.7	79.5	76.4	1.69	0.61	0.19	0.73
Cys	64.6	69.0	71.5	62.7	2.39	0.78	0.02	0.30
Glu	82.5	86.3	85.7	80.2	2.02	0.45	0.04	0.49
Gly	14.0	25.5	23.3	8.8	6.10	0.55	0.06	0.46
Ser	80.2	82.0	83.5	80.3	1.54	0.82	0.15	0.39
Tyr	78.3	83.3	83.2	78.9	1.51	0.82	0.01	0.06
Mean	68.0	72.9	72.0	66.7	2.42	0.82	0.08	0.34
Total AA mean	65.7	70.4	69.9	63.8	2.46	0.61	0.05	0.40

¹Contrast: control diet (without protease supplementation) vs. protease supplementation (25 to 75 g/ton). Each dietary treatment had 10 observations.