Table 4. Effect of stock density and nutrient levels on plasma immunoglobulins and corticosterone in Korean native chickens (d 70)

Treatment¹		Immunoglobulins (μg/mL)		Corticosterone (ng/mL)
SD	EL	IgA	IgM	Corticosterone (ng/mL)
14 ×	Low	59.62	1.32^ab	50.42
14 ×	High	57.79	1.19^b	56.67
16 ×	Low	54.10	1.25^ab	54.10
16 ×	High	57.81	1.51^a	51.93
14		58.70	1.25	53.55
16		55.95	1.38	53.01
	Low	56.86	1.29	52.26
	High	57.80	1.35	54.30
SEM²		1.50	0.04	1.65
P-vlaue³
SD		0.377	0.119	0.877
EL		0.765	0.446	0.551
SD×EL		0.390	0.009	0.233

Means in same rows with different superscripts are significantly different (P<0.05).
SD: stock density (birds/m²); EL: energy levels (ME kcal/kg): High: starter (3,150), grower (3,200), final (3,250); Low: starter (2,950), grower (3,000), final (3,050).
SEM: standard error of means.
SD: stock density; EL: energy levels; SD × EL: stock density × energy levels.