In TX, once a pig is in your possession they're either to be killed immediately or taken alive to a facility to where they will be killed. There is a provision for boar to be sold to fenced in hunting areas, but not sows. Castrating boar (to create a barr) used to be common practice down here but current laws forbid it. Some people make decent money trapping and selling wild hogs down here, but the prices have been poor lately. It shuts down completely in the summer as it's too hot.
George