Table 2. Effects of different protease and nutrient density feed on growth performance in growing-finishing pigs

Items	High1)			Basal			SE	Den		Pro			p-value
	CON	PTA	PTB	CON	PTA	PTB		High	Basal	CON	PTA	PTB	Den	Pro	Den× Pro
BW (kg)
Initial BW	18.79	18.80	18.56	18.70	18.81	18.73	0.126	18.72	18.75	18.74	18.81	18.64	0.778	0.449	0.624
2 wk	27.91	28.02	27.91	27.46	27.99	27.50	0.187	27.95	27.65	27.68	28.01	27.71	0.071	0.188	0.496
4 wk	38.46	39.66	38.84	37.89	39.29	38.89	0.399	38.99	38.69	38.18b	39.48a	38.86ab	0.378	0.015	0.737
6 wk	51.56	52.63	51.99	50.40	52.06	52.14	0.387	52.06	51.54	50.98b	52.35a	52.06a	0.114	0.006	0.266
9 wk	71.96	71.92	70.56	70.82	71.35	71.41	0.931	71.48	71.19	71.39	71.64	70.99	0.710	0.784	0.558
13 wk	98.02	98.46	95.22	96.71	98.76	96.60	1.022	97.23	97.36	97.36	98.61	95.91	0.881	0.052	0.434
15 wk	111.71	113.50	110.43	110.42	111.93	111.20	0.884	111.88	111.19	111.07	112.72	110.82	0.347	0.092	0.372
0 to 2 wk
ADG (kg)	0.65	0.66	0.67	0.63	0.66	0.63	0.011	0.66	0.64	0.64	0.66	0.65	0.025	0.300	0.294
ADFI (kg)	1.25	1.23	1.21	1.21	1.24	1.21	0.004	1.23	1.22	1.23	1.23	1.21	0.813	0.873	0.843
FCR (kg/kg)	1.92	1.86	1.82	1.94	1.89	1.93	0.087	1.86	1.92	1.93	1.87	1.87	0.536	0.865	0.575
2 to 4 wk
ADG (kg)	0.75	0.83	0.78	0.75	0.81	0.81	0.021	0.79	0.79	0.75b	0.82a	0.80ab	0.999	0.013	0.412
ADFI (kg)	1.70	1.73	1.70	1.63	1.76	1.77	0.061	1.71	1.72	1.67	1.75	1.73	0.890	0.373	0.478
FCR (kg/kg)	2.26	2.08	2.18	2.18	2.18	2.17	0.051	2.17	2.18	2.22	2.13	2.18	0.936	0.088	0.165
4 to 6 wk
ADG (kg)	0.94	0.93	0.94	0.89	0.91	0.95	0.009	0.93	0.92	0.91b	0.92ab	0.94a	0.046	0.015	0.053
ADFI (kg)	2.02	2.19	2.19	2.20	2.13	2.19	0.050	2.13	2.17	2.11	2.16	2.19	0.385	0.315	0.073
FCR (kg/kg)	2.15b	2.36ab	2.33ab	2.47a	2.34ab	2.30ab	0.060	2.29	2.37	2.31	2.35	2.32	0.109	0.768	0.011
0 to 6 wk
ADG (kg)	0.78	0.81	0.80	0.75	0.79	0.80	0.007	0.79	0.78	0.77b	0.80a	0.80a	0.048	0.001	0.279
ADFI (kg)	1.66	1.72	1.70	1.68	1.71	1.72	0.033	1.69	1.70	1.67	1.71	1.71	0.671	0.339	0.902
FCR (kg/kg)	2.13	2.12	2.13	2.24	2.17	2.15	0.045	2.13	2.18	2.17	2.15	2.15	0.255	0.672	0.754
6 to 9 wk
ADG (kg)	0.97	0.92	0.88	0.97	0.92	0.92	0.042	0.92	0.94	0.97	0.92	0.90	0.744	0.239	0.904
ADFI (kg)	2.40	2.39	2.39	2.48	2.46	2.49	0.032	2.39	2.48	2.44	2.42	2.44	0.005	0.772	0.881
FCR (kg/kg)	2.48	2.60	2.70	2.55	2.67	2.71	0.118	2.59	2.65	2.51	2.64	2.71	0.476	0.416	0.972
9 to 13 wk
ADG (kg)	0.93	0.95	0.88	0.94	0.98	0.90	0.025	0.92	0.93	0.93ab	0.97a	0.89b	0.321	0.025	0.921
ADFI (kg)	2.59	2.60	2.59	2.64	2.62	2.64	0.041	2.60	2.64	2.62	2.61	2.61	0.244	0.981	0.955
FCR (kg/kg)	2.79	2.74	2.94	2.81	2.68	2.93	0.107	2.82	2.82	2.82ab	2.71b	2.94a	0.439	0.034	0.764
13 to 15 wk
ADG (kg)	0.98	1.07	1.09	0.93	0.94	1.02	0.037	1.05	0.99	0.98b	1.01ab	1.06a	0.016	0.046	0.508
ADFI (kg)	3.15	3.09	3.13	2.99	3.06	3.11	0.045	3.12	3.05	3.07	3.08	3.12	0.066	0.456	0.258
FCR (kg/kg)	3.22	2.88	2.88	3.21	3.26	3.04	0.111	2.98	3.09	3.13	3.05	2.93	0.067	0.064	0.231
6 to 15 wk
ADG (kg)	0.95	0.96	0.93	0.95	0.95	0.93	0.010	0.95	0.95	0.95ab	0.96a	0.93b	0.695	0.031	0.695
ADFI (kg)	2.65	2.64	2.65	2.67	2.66	2.69	0.027	2.64	2.67	2.66	2.65	2.67	0.201	0.788	0.834
FCR (kg/kg)	2.78	2.74	2.85	2.80	2.80	2.89	0.041	2.79	2.82	2.79	2.77	2.86	0.243	0.056	0.849
0 to 15 wk
ADG (kg)	0.89	0.90	0.87	0.87	0.89	0.88	0.008	0.89	0.88	0.88	0.89	0.88	0.286	0.098	0.535
ADFI (kg)	2.26	2.27	2.27	2.27	2.28	2.31	0.016	2.27	2.29	2.26	2.28	2.29	0.109	0.360	0.611
FCR (kg/kg)	2.55	2.53	2.59	2.60	2.57	2.63	0.027	2.55	2.6	2.57	2.55	2.61	0.057	0.104	0.890

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; BW, body weight; ADG, average daily gain; ADFI, average daily feed intake; FCR, feed conversion ratio.