Russ Kremer with some of his hogs on his farm in Frankenstein, Mo., in 2009. Instead of buying conventional feed, Kremer grazes his hogs in a pasture, and grows grains and legumes for them.
Jeff Roberson /AP
Pigs take a mud bath at the De Jofrahoeve pig farm in Esch, Netherlands. Dutch farmers treat their animals with almost three times the antibiotics that their Danish neighbors use.
Robin Utrecht/AFP/Getty Images