(13)In order to allow a uniform application of the legislation, feed materials and complementary feed should not contain additives above a certain level. However, highly concentrated feed, such as licking buckets containing minerals, may be used for direct feeding if the composition meets the particular nutritional purpose in respect of the relevant intended use. Conditions governing the use of such feed should appear on the labelling in order to ensure that the rules regarding the content of feed additives in the daily ration are complied with.