Antimicrobial Growth Promotors
Performance enhancing antibacterial growth promoters like zinc bacitracin, spiramycin, tylosin, virginiamycin, and olaquindox, are regulated by Council Directive 70/524/EEC as zootechnical feed additives and specified tolerances for their inclusion are given in the annex of that document. Whenever drug preparations are administered to food-producing animals, residues thereof in edible tissues, milk or eggs are likely. Residues of antibacterial drugs in food could lead to allergic reactions but the greatest threat is the development of resistant strains of bacteria which could lead to an improper response to normal drug treatment in humans. For these reasons the European Commission decided to ban some of the regulated growth promoters. With Council Regulation 2821/98 zinc bacitracin, spiramycin, tylosin and virginiamycin, and with Commission Regulation 2788/98 olaquindox, were banned from animal feed.