NPR - Antibiotic-Free Meat Business Is Booming, Thanks To Chipotle

"To be sure, antibiotic-free meat still makes up a tiny share of the market. Economists estimate it's around 2 percent. But demand is growing."

http://www.npr.org/blogs/thesalt/2012/05/31/154084442/antibiotic-free-meat-business-is-booming-thanks-to-chipotle