Livestock on leftovers is the term given to a theoretical model of a food system with a specific, limited role for livestock agriculture inspired by traditional uses of livestock as recyclers of food waste. Using this system, livestock animals would eat only human-inedible feedstuffs such as grass, food waste, waste biomass from biofuel production and other industrial by-products – thus recycling otherwise inedible biomass streams into the food system. This concept has been proposed as a way of minimising feed-food competition without eliminating animal agriculture altogether.