In the experimental station of the Thünen-Institute of Organic Farming the dairy breeds Holstein-Friesian (SBT) and Red Holstein double usage (RBT) are kept in separate herds under identical conditions. By means of a material flow FARM-Model, designed with the life cycle assessment (LCA) and material flow software Umberto, an assessment from cradle to farm gate of standard environmental impact categories was undertaken. While the BH has a better environmental performance due to higher milk yields the results depend largely on used algorithms in the model. When benchmarking different farms in terms of environmental performance modeling uncertainty has to be taken into account
