Use of organically complexed trace elements as chelates in the feeding of farm animals

After reviewing the importance and problems of adequate provision by microe lements of farm animals, the authors summarise the procedures, biochemical and physiological relations of supplying. They discuss the possibilities an d different chemical relations of formation of chelate complexes. Finally the authors give a detailed account of the favourable results of di fferent animal trials that were completed in foreign and home stock-farms u sing selenium-, chromium-, zinc, copper- and manganese-protein, amino acids and yeast culture chelate complexes.