Table 4.

Effects of different ZnO sources on the serum immunoglobulins (mg/dL) in weanling pigs

Item	CL1)	HME (ppm)			P-ZnO1)	SEM	Contrasts2) (p-value)
		500	1,000	2,500			CL vs others	HME vs P-ZnO	L	Q
Phase I (d 14)
IgG	249	238	225	232	236	15.5	0.652	0.811	0.321	0192
IgA	27.2	27.5	28.7	28.6	29.5	0.57	0.077	0.112	0.112	0526
IgM	6.25	6.75	6.67	6.75	6.50	0.27	0.185	0.451	0.185	0.623
Phase II (d 28)
IgG	264	248	242	261	245	14.9	0.319	0.725	0.912	0.348
IgA	27.9	28.9	29.7	28.6	30.2	0.53	0.087	0.259	0.522	0.205
IgM	6.50	7.25	7.00	6.88	6.75	0.22	0.126	0.264	0.698	0.126

HME, hot melt extrusion; SEM, standard error of means; Ig, immunoglobulin.

¹⁾CL, basal diet without ZnO; HME, basal diet with 500, 1,000, and 2,500 ppm Zn as HME-ZnO; P-ZnO, basal diet with 2,500 ppm Zn as ZnO.

²⁾Linear (L) and quadratic (Q) effects of HME concentrations.