Hello,
I just wanted to mention another type of attractant other than something to eat. We all know that pigs are quite easy to bring in with "bait" but they also love to rub and waller. I have known some guys who take an old piece of carpet and soak it thoroughly with burnt motor oil or better yet old fish cooking oil or turkey oil. It is then nailed around a big tree in an area known for pig activity. The pigs will rub against it to rid thenselves of pests and parisites. The cooking oil works best since it smells like something to eat, but the motor oil works good to. Of course, a healthy pile of bait nearby would help bring them in but I have known this to work repeatedly even after the pigs have left the area. Try it, it just may work for you, Good Luck, and God Bless.
Dave