Table 5. Effects of stocking density on serum immunoglobulins and cortisol in broiler (d 35)

Parameters	Stock density (kg/m2)				SEM1	P-values2
	26	22	19	16		Linear	Quadratic
Immunoglobulins (pg/mL)
IgA	11.56	13.49	11.81	11.69	0.501	0.531	0.090
IgM	0.99	0.96	0.99	0.96	0.035	0.773	0.937
IgG	9.31a	9.03a	8.34a	5.19b	0.621	0.216	0.004
Cortisol (ng/mL)
Corticosterone	45.84	45.68	44.73	37.50	2.670	0.037	0.246

SEM, standard error of means.
Orthogonal contrasts: linear and quadratic effect of supplemental yeast culture.
Means in same rows with different superscripts are significantly different (P<0.05).