This document specifies a high performance liquid chromatographic – tandem mass spectrometry (HPLCMS/ MS) method for the simultaneous screening and/or determination of the eleven authorized coccidiostats (halofuginone hydrobromide, robenidine hydrochloride, nicarbazin, diclazuril, decoquinate, monensin sodium, salinomycin sodium, narasin, lasalocid A sodium, semduramicin sodium and maduramicin ammonium alpha) contents in compound feeds and feed materials of plant origin at additive and cross-contamination levels and of the five non-registered coccidiostats (ethopabate, clopidol, ronidazole, dimetridazole and amprolium) at sub-additive levels and for the screening of the prohibited furazolidone antibiotic at sub-additive level, in the same matrices.