They are probabally just feral hoggs that are making it in the wild. I know that the Wisc. DNR gets blamed for importing alot of animals that the don't. Everytime a new exotic is seen up here the DNR gets the blame, including RATTLESNAKES!!!
How far is that area from Lacross? I take a trip hunting down there every fall and bowhunting piggs would be awesom!! Suer beats buying pork to mix with my venny for bratts.