For the determination of antibiotic residues in industrial poultry carcasses in mazandaran province, 815 carcasses are sampled from three slaughterhouses      (Sari- Qaemshahr- Amol). For this purpose, the method of F.P.T (Four – Plate  – Test) was used. The principle of this method is formation of pellucid halo (inhibitory zone) around the extract in agar plate that was cultured with equal layer of bacteria. Altogether from 815 carcasses, were                examinated. 533 carcasses (%65.4) were called for antibiotic residues, at least in one organ (muscle- liver-kidney) or tow and or all three organs. Meanwhile, kidney with the most case positive (antibiotic residues) (%52.2) and then liver (%51) and muscle (%44.5) repose.

Keywords: Key word: Antibiotic residues, Poultry Carcass, Four –Plate – Test

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