Table 5.

Effects of dietary substitution of ZnSO₄ by low levels of ZnMet on IgA, IgM and IgG of 37- to -79-d-old piglets ¹.

Item	Control	ZnSO4+ZnMet, mg/kg				SEM	p-Value	p-Value
	100 + 0	75 + 12.5	50 + 25	25 + 37.5	0 + 50			Linear	Quadratic
IgA	0.510b	0.521b	0.572 a	0.604 a	0.589 a	0.007	<0.001	<0.001	<0.001
IgM	0.483b	0.493 b	0.518 a	0.496 ab	0.480 b	0.003	0.012	0.936	<0.01
IgG	4.005	4.890	4.305	4.380	4.435	0.147	0.459	0.742	0.693

^{a, b} Means within a row with different superscripts differ significantly (p < 0.05). ¹ Values are means and pooled SEMs, n = 7.