While it is true that the use of antibiotics among dairy cows and pigs bred for meat fell by more than 10 percent in 2009 and among calves bred for meat by four percent, use among broiler chickens remained constant while use rose by more than 10 percent among sows.
http://resource.wur.nl/en/wetenschap/detail/antibiotics_in_livestock_farming_turning_the_corner/