Table 3.

Growth performance of pigs fed corn or sorghum based diets supplemented with and without protease.¹

Item	Corn		Sorghum		SEM	P-value2
	Protease, %		Protease, %			Ing	Enz	Ing × Enz
	0	0.05	0	0.05
BW, kg
Initial	18.36	18.42	18.43	18.44	0.67	0.608	0.726	0.808
wk 1	22.94	22.82	22.99	23.03	0.88	0.487	0.827	0.674
wk 2	27.30	26.56	27.00	27.59	1.01	0.189	0.793	0.017
wk 3	32.41	31.92	32.45	33.18	1.17	0.081	0.744	0.101
wk 4	38.11	37.89	38.80	39.54	1.35	0.015	0.590	0.308
wk 5	44.28	43.64	44.57	45.53	1.49	0.060	0.780	0.163
ADG, g
wk 1	654	649	652	672	32	0.527	0.648	0.431
wk 2	623	535	593	651	37	0.198	0.656	0.033
wk 3	742	765	779	800	43	0.168	0.393	0.938
wk 4	815	863	907	943	43	0.006	0.159	0.840
wk 5	881	846	824	855	35	0.450	0.943	0.296
Phase 1 (wk 1 to 3)	673	650	675	707	26	0.039	0.727	0.051
Phase 2 (wk 4 to 5)	848	854	866	899	29	0.155	0.359	0.525
Overall (wk 1 to 5)	760	752	770	803	23	0.020	0.327	0.103
ADFI, g
wk 1	1,003	1,007	1,029	1,057	50	0.073	0.427	0.557
wk 2	1,112	1,033	1,113	1,171	50	0.034	0.741	0.038
wk 3	1,346	1,343	1,381	1,525	60	0.003	0.047	0.038
wk 4	1,536	1,631	1,735	1,754	78	0.013	0.356	0.537
wk 5	1,881	1,844	1,958	2,003	81	0.040	0.938	0.462
Phase 1 (wk 1 to 3)	1,154	1,128	1,175	1,251	49	0.002	0.251	0.024
Phase 2 (wk 4 to 5)	1,708	1,737	1,846	1,879	71	0.007	0.534	0.975
Overall (wk 1 to 5)	1,375	1,372	1,443	1,502	55	0.001	0.307	0.246
G:F
wk 1	0.655	0.642	0.635	0.637	0.009	0.164	0.577	0.414
wk 2	0.558	0.514	0.538	0.553	0.027	0.638	0.473	0.153
wk 3	0.553	0.575	0.563	0.536	0.029	0.488	0.905	0.246
wk 4	0.534	0.532	0.528	0.543	0.022	0.897	0.762	0.661
wk 5	0.472	0.461	0.421	0.433	0.014	0.008	0.999	0.414
Phase 1 (wk 1 to 3)	0.585	0.578	0.577	0.570	0.018	0.425	0.462	0.997
Phase 2 (wk 4 to 5)	0.499	0.494	0.469	0.484	0.014	0.034	0.629	0.285
Overall (wk 1 to 5)	0.555	0.551	0.535	0.539	0.009	0.029	0.993	0.571

BW = body weight; ADG = average daily gain; ADFI = average daily feed intake; G:F = feed conversion ratio.

¹Protease was Versazyme (BRI Inc., RTP, NC, USA) at 0.05% replacing either corn or sorghum for treatment diets, providing 300,000 U keratinase activity/kg feed.

²Ing: main effect of ingredient; Enz: main effect of protease; Ing × Enz: interaction effect between ingredient and protease.