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Effect of pine needle extract (PNE) supplementation on serum immune parameters IgA (A), IgG (B), and IgM (C) of laying hens. IgA, immunoglobulin A; IgG, immunoglobulin G; IgM, immunoglobulin M. Asterisks denote significant differences (**p ≤ 0.01), n = 6 per group, data are expressed as means ± SD.
