However, the serum TNF-a concentration in the G–B group
was reduced by 3.64–40.5% compared to other groups, and no significant difference was found between
the G–B and B–G groups in any type of detection index at the end of the experiment. These results suggested
that the combination of G–B and B–G monochromatic light could effectively enhance the antibody
titer, the proliferation index of lymphocytes and alleviate the stress response in broilers