CLOSING THE PLANT-ANIMAL LOOP: A PREREQUISITE FOR ORGANIC FARMING Marina A.BlekenauthorHåvardSteinshamnauthorErlingThuenauthorMatthiasKoeslingauthorAn analysis of a number of published surveys of dairy farms in Europe is used to exemplify the consequences of the use of external feed on nitrogen loss from organic animal productions. It is concluded that the present international regulations are not adequate to enforce the adoption of environmentally friendly and sustainable organic production systems, in harmonious balance between crop production and animal husbandry. Production systems2005Conference paper, poster, etc.