Some life cycle assessment studies have stated that animals should be used in the food system only to con-vert biomass that humans cannot or do not want to eat into valuable products. Food should not be fed to animals. While this may be reasonable from an ethical perspec-tive, it has to be economically feasible in order to be applied in practice. Based on experimental data, we assess whether a zero concentrate supplementation in Swiss organic dairy production would be competitive against the current feeding norm. Because the culling rate increased considerably, not feeding concentrates led to a significant reduction in profits. However, if it is assumed that the culling rate could be kept under control by breeding and management adjustments, the reduction in profits is comparably low and not statistically different from zero.
