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LC-MS (SIM) chromatogram of pig feces sample spiked with all analyzing antibacterial substances at first validation level (1—lincomycin 125 µg/kg; 2—trimethoprim 25 µg/kg; 3—oxytetracycline 100 µg/kg; 4—ciprofloxacin 50 µg/kg; 5—tetracycline 100 µg/kg; 6—enrofloxacin 50 µg/kg; 7—chlortetracycline 100 µg/kg; 8—doxycycline 100 µg/kg; 9—tylosin 100 µg/kg; 10—tiamulin 100 µg/kg).
