Good biosecurity practices on livestock farms reduce disease transmission, preventing welfare costs of disease while minimising the need for therapeutic antibiotic treatment.
Livestock biosecurity is a welfare-positive practice whose effects operate primarily through prevention. A farm with good biosecurity prevents the introduction and spread of pathogens that cause disease and suffering. The alternative - disease spreading through a susceptible population - causes widespread welfare harm and often triggers regulatory culling responses that impose immediate welfare costs on entire flocks or herds, including animals not yet infected. Biosecurity is therefore not merely a disease control measure but a fundamental welfare management tool that protects animal welfare at herd and population scale.