To prevent the development of dangerous antibiotic-resistant bacteria that could endanger lives, the US Food and Drug Administration is recommending that livestock farmers stop giving antibiotics to livestock, which are administered in their water to spur unnaturally accelerated growth.

http://www.washingtonpost.com/wp-dyn/content/article/2010/06/28/AR2010062804973.html
http://www.edmontonjournal.com/health/regulator+recommends+limits+livestock+drugs/3214267/story.html