The study was conducted to evaluate the applicability of ultra high-performance liquid chromatography - tandem mass spectrometry method (UHPLC-MS/MS), establish the MS/MS detection parameters and determine the validation characteristics for the analysis of residual content of avermectins in milk. The UHPLC-MS/MS method has proved to be accurate, practical and universal. This was confirmed by Decision limit (CCα) data: abamectin - 12.56 μg/kg, doramectin - 17.74 μg/kg, eprinomectin - 24.02 μg/kg, ivermectin - 12.53 μg/kg, moxidectin - 44.69 μg/kg, recovery is 88.7-110%. The data obtained for assessing the suitability, accuracy and reproducibility of the results meet the requirements of the European Directive (2002/657/EC). The efficient ultra high-performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) method that was developed and adopted for routine use by the laboratories of veterinary medicine, allows to detect residual quantities of 5 avermectins used in animal breeding for the prevention of helminthiases in food products including milk.

The conducted studies assessed the suitability of the method of ultra performance liquid chromatography - tandem mass spectrometry (UPLC-MS/MS) and established the MS/MS detection parameters and determined its validation characteristics for the analysis of residual content of coccidiostatics in food eggs. It has been proved that this method is accurate, practical and universal, which is confirmed by the data of ССα for amprolium – 2.14 μg/kg, diclazuril – 2.37 μg/kg, monensin – 2.34 μg/kg, narazin – 2.28 μg/kg, semduramicin – 2.23 μg/kg, toltrazuril 2.5 – μg/kg, salinomycin – 3.32 μg/kg, halofuginone – 6.18 μg/kg, maduramycin – 13.06 μg/kg, decoquinate – 2.37 μg/kg, robenidine – 26.06 μg/kg, nicarbazine – 316.7 μg/kg, percentage of return is 92.4 – 111 %. The results obtained for assessing the suitability, accuracy and reproducibility of the results meet the requirements of the European Directives.The developed method allows to detect residual amounts of about 12 coccidiostatics that are used in poultry for the prevention of coccidiosis.