Table 7.

Effects of different levels of dietary crude protein on immune response in weaning pigs¹⁾

Criteria	Treatment2)						SEM	p-value3)
	CP16	CP17	CP18	CP19	CP20	CP21		L	Q
IgA (mg/mL)
Initial	---------------------------------------------------------- 0.26 ----------------------------------------------------------
3 wk	0.66	0.55	0.74	0.63	0.42	0.55	0.055	0.38	0.76
6 wk	0.60	0.95	0.67	1.02	0.86	0.90	0.309	0.10	0.30
IgG (mg/mL)
Initial	---------------------------------------------------------- 5.89 ----------------------------------------------------------
3 wk	4.85	5.37	7.04	4.73	4.23	6.09	0.050	0.36	0.59
6 wk	4.39	7.64	7.03	6.85	6.40	7.41	0.311	0.07	0.10

SEM, standard error of the mean; IgA, immunoglobulin A; IgG, immunoglobulin G.

¹⁾Least squares means of twelve observations per treatment.

²⁾CP16, corn-SBM-based diet (early weaning CP 16%/late weaning CP 15%); CP17, corn-SBM-based diet (early weaning CP 17%/late weaning CP 16%); CP18, corn-SBM-based diet (early weaning CP 18%/late weaning CP 17%); CP19, corn-SBM-based diet (early weaning CP 19%/late weaning CP 18%); CP20, corn-SBM-based diet (early weaning CP 20%/late weaning CP 19%); CP21, corn-SBM-based diet (early weaning CP 21%/late weaning CP 20%).

³⁾L, linear; Q, quadratic.