Substances incorporated in a premix added to animals’ feed, often for a purpose other than nutrition. They are mainly growth promoters, enhancers of feed conversion, or, commonly, used to provide vitami ns or minerals necessary for a healthy diet. In addition to minerals and vitamins, permitted additives include certain ANTHELMINTICS and and coccidiostats for the control of parasites in farm animals. The use of antibiotics as growth promoters, permitted to a limited extent to date, is being phased out in the EU. Specified dyes, such as the xanthins used to achieve desired coloration of farmed rainbow trout, are also permitted.
Very strict controls apply to the preparation and use of medicated feeds with the principal aim of ensuring that consumers are not put at risk from medicinal residues in food animals. The legislation is contained in the Medicines (Medicated Animal Feeding Stuffs) No. 2 Regulations 1992, the Feeding Stuffs Regulations 2000, the Feeding Stuffs (Establishments and Intermediaries) Regulations 1999 and the Feeding Stuffs (Zootechnical Products) Regulations 1999. All UK compounders, whether commercial or home mixers, must register with the Royal Pharmaceutical Society or the Department of Agriculture for Northern Ireland.
(See also under MEDICINES ACT; ANTIBIOTIC; GROWTH PROMOTERS; HORMONES IN MEAT PRODUCTION.)