The widespread use of antibiotics in animal agriculture raises both public health concerns about resistance and animal welfare questions about the conditions that necessitate mass medication.
High antibiotic use in animal agriculture is both a consequence and a cause of poor animal welfare. Systems in which animals are so crowded and stressed that endemic disease is inevitable require antibiotics to maintain production. Prophylactic antibiotic use masks welfare-compromising conditions that would otherwise be visible as disease. Reducing antibiotic dependency requires improving the conditions that make mass medication necessary — better housing, lower stocking densities, genetic selection for disease resistance — which simultaneously improves animal welfare. This creates a productive alignment between welfare and public health goals.