Princeton University-led research found that antibiotic consumption in livestock worldwide could rise by 67 percent between 2010 and 2030, and possibly endanger the effectiveness of antimicrobials in humans. Pigs outpace chickens and cattle in estimates of antimicrobial consumption in countries in the Organization for Economic Co-operation and Development, which is a consortium of 34 nations that includes the United States and most of the European Union countries. The graph measures antibiotic consumption in milligrams (bottom bar) in cattle, chickens and pork per population correction unit, or PCU, which corresponds to 1 kilogram of the respective animal. The average amount of antibiotics increases from left to right. The researchers found that pigs could consume an average 172 mg of antibiotics per kilogram of animal compared to 148 mg for chickens and 45 mg for cattle.