In order to comply with the Memorandum of Understanding on oil seeds between the European Economic Community and the United States of America within the framework of the GATT, as approved by Council Decision 93/355/EEC, a monitoring system should be introduced to assess the quantities, in soya-bean-meal equivalent, of by-products intended for human or animal consumption and obtained from colza seed, rapeseed, sunflower seed or soya beans grown on land set aside for purposes other than production for human or animal consumption.