There is mounting concern that use of antibiotics in livestock will contribute to antimicrobial-resistant pathogens, with repercussions for human and animal health. This report explores how limiting antibiotic use for livestock productivity-enhancement purposes may affect farmer practices and profits, as well as market prices and volumes.See related Amber Waves article: Restrictions on Antibiotic Use for Production Purposes in U.S. Livestock Industries Likely To Have Small Effects on Prices and Quantities