Roughly 73% of all antibiotics consumed worldwide go to livestock, not people. In the United States specifically, about 80% of all antibiotics sold are destined for animal agriculture. These numbers make farming the single largest consumer of antibiotics on the planet, outpacing hospitals, clinics, and pharmacies combined.
Global and U.S. Numbers
The global estimate of 73% comes from analyses of antibiotic consumption across the meat industry, encompassing cattle, pigs, poultry, and aquaculture. In raw volume, researchers estimated that chickens, cattle, and pigs alone accounted for about 93,300 tonnes of antibiotic active ingredients in 2017. That figure is projected to climb roughly 11.5% by 2030, reaching around 104,000 tonnes as global meat demand grows.
The U.S. picture is even more lopsided. Of all antibiotics sold in the country, approximately 80% go to food-producing animals. About 70% of those agricultural antibiotics are “medically important,” meaning they belong to the same drug classes doctors rely on to treat infections in people. More recent analyses put that medically important share at around 54% to 66% of all antimicrobials used in U.S. animal agriculture, with swine and cattle operations accounting for the largest portions.
Why Farmers Use So Many Antibiotics
Antibiotics in agriculture serve three broad purposes: treating animals that are already sick, preventing disease in animals exposed to illness, and promoting faster growth. For decades, low doses of antibiotics were mixed into animal feed simply because they made livestock gain weight more efficiently. The growth promotion use has drawn the most criticism because it exposes bacteria to just enough antibiotic to encourage resistance without actually curing disease.
The World Health Organization now recommends that farmers and the food industry stop using antibiotics routinely to promote growth and prevent disease in healthy animals. Several countries have acted on this. The European Union banned antibiotic growth promoters in 2006, and the U.S. phased out growth promotion uses of medically important antibiotics in 2017. Still, prevention and treatment uses remain high, and the line between “prevention” and routine use in crowded facilities can be thin.
Which Animals Get the Most
Not all livestock receive antibiotics at the same rate. Per kilogram of meat produced, pigs consume the most at an estimated 172 milligrams per kilogram. Chickens come in close behind at 148 mg/kg. Cattle use significantly less on a per-kilogram basis, around 45 mg/kg. The higher rates in pigs and poultry reflect the intensive, confined conditions in which these animals are typically raised, where disease spreads quickly and producers rely on antibiotics as a management tool.
What Europe’s Numbers Show
The European Union tracks veterinary antibiotic sales closely through the European Medicines Agency. In 2024, EU countries reported total sales of about 4,403 tonnes of veterinary antimicrobials, with 98.5% of that volume going to food-producing animals. Actual recorded use was lower, around 3,297 tonnes, reflecting the gap between what’s sold and what’s administered. At the EU level, sales worked out to about 46.1 mg per kilogram of estimated animal biomass, a figure that ticked up 5.1% from the previous year after years of steady decline.
Europe’s numbers are considerably lower per animal than those in many other regions, largely because of stricter regulations. But the recent uptick shows that progress isn’t always linear.
The Connection to Antibiotic Resistance
The reason these percentages matter is antibiotic resistance. When bacteria in livestock are repeatedly exposed to antibiotics, resistant strains emerge. Those resistant bacteria can reach people through direct contact with animals, through the food supply, through manure that contaminates water and soil, and even through airborne particles near farms.
Research across the 30 largest animal-producing countries between 2010 and 2020 found a clear positive correlation: higher antibiotic use in farmed animals corresponded with higher rates of antibiotic-resistant infections in humans. The relationship wasn’t limited to individual countries. Resistance patterns showed spatial dependence between neighboring nations, meaning one country’s agricultural antibiotic use could contribute to resistance problems across its borders. This finding supports the case for globally coordinated regulation rather than country-by-country approaches.
Why the Exact Numbers Are Hard to Pin Down
You’ll see slightly different percentages depending on the source, and that’s partly because measuring agricultural antibiotic use is more complicated than it sounds. Most national tracking systems rely on sales data: how many kilograms of a given antibiotic were sold for veterinary use. But sales data don’t capture what actually goes into an animal. A farmer might buy antibiotics and stockpile them, or use different doses than what labels recommend.
Researchers try to improve accuracy by converting raw sales into standardized “daily doses,” adjusting for typical animal weights and recommended dosing. But even these calculated doses are technical estimates, not records of what happened on a specific farm. Collecting actual usage data requires farm-level monitoring, which is expensive and labor-intensive. As a result, most global figures are best understood as well-informed approximations rather than precise measurements. The overall picture, that agriculture dominates global antibiotic consumption, is consistent across every major analysis regardless of methodology.
What’s Changing
Regulatory pressure is shifting the landscape. The WHO’s guidelines against routine use in healthy animals have influenced policy in dozens of countries. The EU’s strict framework has driven substantial reductions over the past decade. In the U.S., the FDA has moved medically important antibiotics under veterinary oversight, requiring prescriptions rather than allowing over-the-counter purchases for feed additives.
These changes have had measurable effects in some regions. But global consumption is still rising overall, driven by expanding livestock production in Asia, Africa, and South America, where demand for meat is growing fastest and regulatory infrastructure is still developing. The projected 11.5% increase by 2030 suggests that without broader international coordination, the gains made in Europe and North America could be offset by growth elsewhere.