Table 3. Effects of different protease and nutrient density feed on nutrient digestibility in growing-finishing pigs

Items (%)	High¹⁾			Basal			SE	Den		Pro			p-value
Items (%)	CON	PTA	PTB	CON	PTA	PTB	SE	High	Basal	CON	PTA	PTB	Den	Pro	Den× Pro
DM
6 wk	88.29	88.88	89.01	88.54	89.18	88.78	0.325	89.06	88.83	88.91	89.03	88.89	0.402	0.909	0.290
13 wk	88.60	89.03	88.63	88.08	88.80	88.45	0.346	88.75	88.44	88.34	88.91	88.54	0.289	0.267	0.862
CP
6 wk	70.78	72.06	71.48	67.75	69.69	68.59	0.539	71.44	68.68	69.26^b	70.87^a	70.04^ab	< .0001	0.027	0.816
13 wk	67.34^c	71.39^a	69.48^b	70.96^ab	70.88^ab	72.10^a	0.501	69.40	71.32	69.15^b	71.13^a	70.79^a	0.001	0.002	0.002
GE
6 wk	74.91	74.35	74.51	74.19	74.73	74.16	0.356	74.59	74.36	74.55	74.54	74.33	0.435	0.786	0.311
13 wk	70.68	72.63	71.93	70.55	72.13	71.33	0.545	71.74	71.33	70.61^b	72.38^a	71.63^ab	0.371	0.016	0.900

High nutrient density is 0.94%–0.98% higher than requirement in dietary protein and 50 kcal/kg in energy than basal nutrient density.
Means in the same row with difference superscripts differ at p < 0.05.
High, high nutrient density diet; Basal, basal nutrient density diet; Den, different nutrient density diet; Pro, supplementation of protease; CON, basal diet; PTA, CON + 0.0125% protease A; PTB, CON + 0.010% protease B; Den × Pro, different nutrient density diet × supplementation of protease; DM, dry matter; CP, crude protein; GE, gross energy.