Walking along early morning (or in this pic, afternoon after work) with a rifle, the road is crossed by tracks used by feral pigs. They eat lambs and sometimes cattle. So you set up a trap, shot a wild animal, cut its stomach open, dragged it along the road past said tracks, twice or slowly, leaving lots of scent, throw it in the trap, the pigs find a way in, a main entrance for the large ones, a flap entrance for the small ones, can't get out. If you think there are more untrapped you shoot a couple away from the entrances. The others eat them, clearing room for more, attracted by the smell of meat and intestine. Defending agricultural production is time consuming any way you look at it, any way it's done.