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Effect of pine needle extract (PNE) supplementation on serum inflammatory cytokines IL-6 (A), IL-10 (B), IL-1β (C), and TNF-α (D) of laying hens. IL-6, interleukin 6; IL-10, interleukin-10; IL-1β, interleukin-1β; TNF-α, tumor necrosis factor-α. Asterisks denote significant differences (**p ≤ 0.01), n = 6 per group, data are expressed as means ± SD.
