The livestock sector needs an overhaul. Among available options, one is turning back to using local feed resources. It amounts to designing and implementing more circular farm and food systems. We explain how this can be translated in principles and in practice. First, by valuing all sources of biomass for feed in a territory especially by-products, abandoned land and rangelands that are currently undervalued. Second, by reconnecting crops, pastures and livestock at the farm and/or territory levels to take advantage of their complementarities and even create new synergies. Then, we list the multiple sociotechnical lock-ins (insufficient knowledge, absence of peer networks, lack of governance rules, etc.) that are to be addressed through innovations (e.g. creation of a farmer cooperative in charge of the logistics, the development of stable outlets, etc.) to allow for implementation of these more circular farm and food systems. Finally, we identify seven promising interdisciplinary analytical and systems research avenues to further using local feed resources for livestock farming.