http://orgprints.org/4304/ CLOSING THE PLANT-ANIMAL LOOP: A PREREQUISITE FOR ORGANIC FARMING An 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. Bleken, Marina A. Steinshamn, Håvard Thuen, Erling Koesling, Matthias 1animalprod int-conf-isofar-2005 CLOSING THE PLANT-ANIMAL LOOP: A PREREQUISITE FOR ORGANIC FARMING 2005-11-15 Bleken, Marina A.; Steinshamn, Håvard; Thuen, Erling and Koesling, Matthias (2005) CLOSING THE PLANT-ANIMAL LOOP: A PREREQUISITE FOR ORGANIC FARMING. Researching Sustainable Systems - International Scientific Conference on Organic Agriculture, Adelaide, Australia, September 21-23, 2005. [ Unpublished, ] source