Integrating circularity as an essential pillar of dairy farm sustainability

Given the complex and often negative interactions between humanity and nature, methodologies and frameworks for assessing the concepts of circularity (C) and sustainability (S) have become the focus of many studies in the last decade. However, C and S have developed partially independently, impairing the interpretation of their intricate relationships. In this context, there is still no regulatory framework on how to assess them in an integrated manner through simple but robust indicators. To fill this gap, this study proposes an evaluation framework that allows the holistic integration of C and S indicators (integration of CIrcularity and SUstainable indicators – CISU methodology) taking the dairy sector as a case study. For this purpose, 50 Spanish dairy farms have been selected to estimate a Composite Dairy Farm index (CDFi) as a result of the integration of 9 C indicators and 21 S indicators. The results obtained showed a relative homogeneity among dairy farms as well as some room for improvement, with the CDFi (scores from 0 to 100) varying from 36 to 64 points. The results indicate that minimising reliance on external cow feed, use of own-produced fodders, and suitable field management are essential to achieve a circular and sustainable milk production system. This manuscript contributes with the proposal of a novel framework that can be adapted to different companies and products to assess the implementation of CE principles to achieve sustainable development. However, the integration of additional aspects, such as industrial symbiosis, or its applicability at meso level appear as challenges in order to implement sustainable development throughout the supply chain.