AmproliumPyrantelChromatography, High Pressure LiquidCoccidiostatsPoultry ProductsSpectrophotometry, UltravioletChromatography, GasCalibrationReference StandardsIndicators and ReagentsReproducibility of ResultsPyrithiamineDrug ResiduesMicrochemistrySensitivity and SpecificityThiamineOxythiamineChromatography, LiquidMethods