Effects of dietary algae-derived polysaccharides (ADP) on relative mRNA expression of NF-κB pathway related genes of bursa of Fabricius in broilers under heat stress. TN, thermoneutral zone group (23.6 ± 1.8°C); HS, heat stress group (33.2 ± 1.5°C for 10 h/day); HSA, heat stress + ADP group (supplemented with 1,000 mg/kg ADP). IκBα, inhibitor kappa B alpha; NF-κB p65, nuclear factor-kappa B p65; TNF-α, tumor necrosis factor-α, IFN-γ, interferon-γ, IL, interleukin. All data were expressed as means ± SEM (n = 6). abDifferent superscript letters indicate significant differences (P < 0.05).