Global cropland expansion and associated greenhouse gas (GHG) emissions are largely driven by the growing demand of animal-sourced food. Thus, options are urgently needed to enhancing feed supply at a low environmental cost. Here we explored a set of scenarios about improving domestic feed supply, using a linear optimization model. Results indicate that the total feed (energy and protein) production may be increased by 18–32% through optimizing the spatial distribution of feed crops across provinces, without additional cropland input. GHG emissions and nitrogen and phosphorus inputs per MJ of produced feed decreased by 18–25%, 18–23%, and 16–21%, respectively. The redistribution strategies provide 10–16% additional animal food, which covers the demand of 195–393 million people. Lastly, we provide suggestions for improving the effectiveness of governmental policies related to spatial planning of crops, so as to alleviate the food-feed competition for cropland and to improve environmental sustainability.

全球农田扩张和相关的温室气体 (GHG) 排放在很大程度上是由对动物源性食品不断增长的需求推动的。因此，迫切需要以低环境成本增加饲料供应的选择。在这里，我们使用线性优化模型探索了一组关于改善国内饲料供应的情景。结果表明，在不增加农田投入的情况下，通过优化饲料作物的跨省空间布局，饲料（能量和蛋白质）总产量可提高 18-32%。每兆焦耳生产饲料的温室气体排放量和氮磷输入量分别下降了 18-25%、18-23% 和 16-21%。再分配战略提供了 10-16% 的额外动物食品，满足了 195-3.93 亿人的需求。最后，