Table 5.

Concentrations of IL‐2 (µg mL⁻¹), TNF‐α (µg mL⁻¹), IgA (µg mL⁻¹), IgG (µg mL⁻¹) and IgM (µg mL⁻¹) of weaning pigs fed diets containing different levels of POM^a

	Dietary POM levels (g kg−1)					Polynomial contrasts (r 2)b
	0.00	5.00	10.00	15.00	SEM	Linear	Quadratic	Cubic	P value
IL‐2	632.03	846.10	1184.48	880.20	120.73	0.3011	0.8005	1.0000	0.030
TNF‐α	267.97	556.46	470.06	525.82	60.62	0.2676	0.7215	1.0000	0.002
IgA	159.07	180.23	167.50	165.83	6.95	−0.375	0.5459	1.0000	0.026
IgG	8.66	9.55	9.61	9.39	2.37	0.2086	0.9724	1.0000	0.034
IgM	13.83	14.23	21.50	21.40	4.04	0.8061	0.8065	1.0000	0.013

IL‐2, interleukin‐2; TNF‐α, tumor necrosis factor‐α; IgA, immunoglobulin A; IgG, immunoglobulin G; IgM, immunoglobulin M.

^aPOM; different dietary concentrations of Pleurotus ostreatus mushroom prepared by drying overnight at 60 °C and pulverized to pass through a 5 mm sieve.

^bPolynomial contrasts (r ²).