Table 4. Effect of light intensity on serum cytokines and corticosterone concentration of broilers at 35 d of age

Parameters	Light intensity (lx)				SEM	p-value
Parameters	5	20	35	50	SEM	p-value
Cytokine (pg/mL)
IL-6	46.87^a	29.99^b	30.31^b	29.15^b	2.540	< 0.05
TNF-α	76.63	74.66	74.73	72.48	2.743	0.766
Cortisol (ng/mL)
Corticosterone	13.70^a	10.90^b	9.96^b	9.93^b	0.014	< 0.05

Means in same rows with different superscripts are significantly different (p < 0.05).
IL-6, interleukin-6; TNF-α, tumor necrosis factor-α.