Regulatory and legal aspects of supplementing grazing ruminants.

The current legal and regulatory status of classes of feed additives is discussed, including food additives permitted in animal feed and drinking water, generally recognized as safe (GRAS) ingredients, and approved animal drugs. A brief description of these feed additive classes is given. Some nutritional and practical considerations are given for feed additives, and some special considerations are provided for free-choice feeding, medicated liquid feeds, sodium molybdate, and chromium compounds.