Table 4.
Effects of light intensity on serum IL-6, TNF-α and corticosterone concentrations in chicks at the age of 7 day

Parameters	Photoperiod (L/D)			SEM1	P-values2
	24 L	22 L/2D	18 L/6D
IL-6 (pg/mL)	31.6	28.5	27.8	1.97	0.36
TNF-α (pg/mL)	23.7	22.0	21.8	0.79	0.22
Corticosterone (ng/mL)	12.4a	10.8ab	9.96b	0.591	<0.05

SEM, standard error of means.
Means in same rows with different superscripts are significantly different (P<0.05).