In western Canada paylean is a swear word. No packer will buy your hogs if they are feed paylean and if you mill feed you have to go through a certification that you are completley free of paylean. A lot of of countries we export to will not take hogs that have been fed paylean. Its just another trade barrier. We still see aggressive pigs without paylean that ear bite, flank suck, and tail bite. Chew chains have been a big help.