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Effect of pine needle extract (PNE) supplementation on serum biochemical indices ALT (A), AST (B), ALP (C), TP (D), ALB (E), and GLU (F) of laying hens. ALT, alanine aminotransferase; AST, aspartate aminotransferase; ALP, alkaline phosphatase; TP, total protein; ALB, albumin; GLU, glucose. Asterisks denote significant differences (*p ≤ 0.05, **p ≤ 0.01), n = 6 per group, data are expressed as means ± SD.
