Intensified monogastric livestock management could conserve feed inputs and mitigate some of the environmental and climate challenges associated with animal production. In this study, we used data from 166 countries to model the environmental, climate and economic impacts of pig and chicken intensification. We found that whole-chain intensification could reduce annual nitrogen and greenhouse gas emissions by 49% (4.6 Tg) and 68% (554 Tg CO₂-equivalent), respectively. These changes translate to 5.0 Tg lower nitrogen fertilizer input for feed production, resulting in an overall benefit of US$93 billion. Integrated crop–livestock optimization under intensive management could release 27 Mha of cropland and provide additional food for 310 million people. A judicious promotion of intensification could alleviate global pressures related to food security, environment and climate change.

强化单胃畜牧管理可以节省饲料投入，并减轻与动物生产相关的一些环境和气候挑战。在这项研究中，我们使用了来自 166 个国家/地区的数据来模拟猪和鸡集约化对环境、气候和经济的影响。我们发现，全链条集约化可以分别减少 49% （4.6 Tg） 和 68% （554 Tg CO₂ 当量）。这些变化转化为饲料生产的氮肥投入减少 5.0 Tg，从而产生 930 亿美元的总体收益。集约化管理下的农牧综合优化可以释放 27 Mha 的农田，并为 3.1 亿人提供额外的食物。明智地促进集约化可以减轻与粮食安全、环境和气候变化相关的全球压力。