The present Regulation authorizes, for a specific period or on a permanent basis, as the case may be, the use of certain additives in feedingstuffs. The preparation belonging to the group “enzymes”, as specified in Annex I, is authorized provisionally for four years as additive in animal nutrition. The preparations belonging to the group ”microorganisms”, as specified in Annex II, are authorized without a time limit as additives in animal nutrition under the conditions laid down in that Annex. T