Biological residue is defined as any
substance, including metabolites, remaining in poultry at the time of slaughter or in any of its tissues after slaughter, as the result of treatment or exposure of the live poultry to a pesticide, organic compound, metallic or
inorganic compound, hormone, hormone - like
substance, growth promoter, antibiotic, anthelmintic, tranquilizer, or
other agent that leaves a residue (9 CFR 381.1).»