All I know is when the Wisconsin DNR heard that some were let loose in the southwestern corner of the State and were starting to breed, they went crazy. They arrested one person who swears he did not let them loose intentionally, and they have told hunters to feel free to shoot them (with a small game license of course).
In fact (I just realized)I have a friend that owns an entire valley (he even wanted to buy the county road that runs up the valley but they would not sell)up in the bluffs along the Mississippi over there. I should call him up and have a talk with my goodold college buddy. I could see if he has a piggy problem.
They do not want them to establish a foot hold in Wisconsin. Not with all of our corn, wheat, soybean and oat fields in the south. They would have a hay day.
I spent a lot of "time"around domestic hogs. Too much in fact if you ask me. They are a strange animal. One thing you learn.. never take them for granted or take your eyes off them. One second they can be just a peaceful eating machine, and the next just down right nasty. I can only imagine what a wild or domestic cross would be like.