catch you a mature sow, put her in a pen in the middle of a corral trap, you will have to provede some water & feed, its like telling the kids where the candy store is
Three problems with this:
1) In cool weather it's not so bad, but you'll still have to provide food and water regularly. In summer, without shade, the sow will die quickly.
2) The odds are pretty good that any sow you catch will already be bred.
3) In Texas, it's illegal to keep a hog more than seven days unless you have an approved facility. http://feralhogs.tamu.edu/frequently-asked-questions-wild-pigs/
(See item #47)