The preparations belonging to the group “Enzymes” and to the group "Vitamins, provitamins and chemically well-defined substances having similar effect", as specified in Annexes I and III respectively, are authorized without a time limit as additives in animal nutrition under the conditions prescribed therein. Furthermore, the preparation belonging to the group “Coccidiostat and other medicinal substances”, as specified in Annex II, is authorized for ten years as additive in animal feedingstuffs.