(4)The existing legislation on the circulation and use of feed materials and compound feed, which includes pet food, namely Council Directive 79/373/EEC of 2 April 1979 on the circulation of compound feedingstuffs 6 , Council Directive 93/74/EEC of 13 September 1993 on feedingstuffs intended for particular nutritional purposes 7 (dietetic feed), Council Directive 96/25/EC of 29 April 1996 on the circulation and use of feed materials 8 and Council Directive 82/471/EEC of 30 June 1982 concerning certain products used in animal nutrition 9 (bio-proteins), needs to be updated and replaced by a single regulation. In the interests of clarity, Council Directive 83/228/EEC of 18 April 1983 on the fixing of guidelines for the assessment of certain products used in animal nutrition 10 and Commission Directive 80/511/EEC of 2 May 1980 authorising, in certain cases, the marketing of compound feedingstuffs in unsealed packages or containers 11 should be repealed.