Discusses the metabolism and fate of xenobiotic compounds, such as veterinary drugs, agrochemicals, and other products to which food-producing animals are exposed. Describes state-of-the-art techniques for experimental studies of xenobiotic compounds in ruminants, poultry, and aquatic species, including study design to meet specific regulatory requirements. Also addresses the fate of specific products such as prilimycin, albenazole tilmicosin, ametryn, sulfonamides, invermectin and avervectin, luprostiol, and the repartitioning agent ractopamine. Offers an introduction to the use and regulation of veterinary drugs in the United States and Europe.