Table 6. Effects of crude protein level and supplementation protease level on blood profiles in weaned piglets and finishing pigs

Item	Main effects					SE	p-value
	Protein level		Protease level				CP	Protease	CP × protease
	HP	LP	PT0	PT1	PT2
Weeks 4
WBC (103 per μL)	17.19	17.36	17.58	17.07	17.19	0.14	0.588	0.362	0.591
RBC (106 per μL)	7.17	7.08	7.19	7.12	7.06	0.12	0.758	0.929	0.975
BUN (mg/dL)	14.5	8.6	11.6	11.3	10.9	0.7	< 0.001	0.268	0.746
IgG (mg/dL)	319	327	313	325	329	4	0.318	0.235	0.681
Weeks 20
WBC (103 per μL)	21.13	21.25	21.31	20.77	21.49	0.53	0.915	0.866	0.500
RBC (106 per μL)	7.45	7.63	7.13	7.79	7.70	0.12	0.758	0.063	0.930
BUN (mg/dL)	12.5	9.8	11.9	11.3	10.4	0.4	0.001	0.204	0.895
IgG (mg/dL)	307	318	308	308	321	6	0.394	0.605	0.688

Each value is the mean value of 4 replicates (4 pigs/pen).
HP, high crude protein (19.00% [days 1–14 phase], 18.05% [days 15–28 phase], 17.10% [growing phase] and 16.15% [finishing phase]); LP, low crude protein (17.00% [days 1–14], 16.15% [days 15–28], 15.30% [growing phase] and 14.45% [finishing phase]; PT0, protease 0 ppm (weanling-finishing phase); PT1, protease 300 ppm (weanling phase) and 150 ppm (growing-finishing phase); PT2, protease 500 ppm (weanling phase) and 300 ppm (growing-finishing phase); CP, crude protein; WBC, white blood cells; RBC, red blood cells; BUN, blood urea nitrogen; IgG, immunoglobulin G.