Table 2. Effect of supplemental protease on growth performance with different CP levels in weaned pig

Variables	Basal1)		Low		SE	CP		PT2)		p-value
	0%	0.1%	0%	0.1%		HP	LP	0	10	CP	PT	CP × PT
BW (kg)
Initial	10.962	10.925	10.940	10.943	0.563	10.944	10.942	10.951	10.934	0.998	0.977	0.972
1 W	13.073	12.940	12.990	13.255	0.432	13.01	13.12	13.03	13.10	0.791	0.880	0.650
2 W	15.680	15.591	15.514	15.680	0.432	15.64	15.60	15.60	15.64	0.930	0.930	0.771
0–1 wk (kg)
ADG	0.302	0.288	0.293	0.331	0.040	0.295	0.312	0.298	0.310	0.675	0.765	0.524
ADFI	0.551	0.551	0.550	0.554	0.002	0.551	0.552	0.551	0.553	0.549	0.294	0.255
G:F	0.548	0.523	0.533	0.597	0.072	0.536	0.565	0.541	0.560	0.695	0.798	0.547
1–2 wk (kg)
ADG	0.373	0.379	0.361	0.346	0.014	0.376	0.354	0.367	0.363	0.141	0.775	0.480
ADFI	0.595	0.599	0.599	0.600	0.003	0.597	0.600	0.597	0.600	0.372	0.341	0.598
G:F	0.627	0.633	0.603	0.577	0.023	0.630	0.590	0.615	0.605	0.107	0.695	0.495
0–2 wk (kg)
ADG	0.337	0.333	0.327	0.338	0.019	0.335	0.333	0.332	0.336	0.894	0.840	0.697
ADFI	0.573	0.575	0.574	0.577	0.002	0.574	0.576	0.574	0.576	0.314	0.237	0.853
G:F	0.588	0.580	0.569	0.586	0.033	0.584	0.578	0.579	0.583	0.850	0.896	0.704

Basal, diet containing 18.78% CP; Low, diet containing 16.92% CP.
PT0, non-supplementation of protease; PT10, supplementation of 0.1% protease.
CP, crude protein; PT, protease; HP, high protein; LP, low crude protein; BW, body weight; ADG, average daily gain; ADFI, average daily feed intake; G:F, feed efficiency.