Hi , all .
I kept large whites , in the Azores , in the late 80's , and one of the problems there, is vermin , specifically rats . Not because of bad practise on my part , but because the place (island) had a large population of them . The local method of killing them, then and now , was to put the type of poisen , which is a (pink) coated barley, which comes in small cellophane bags, and lay said poisen around , this was practise done by both farmers and the council . The draw back is that it has the potential to kill other things , that have fur or hair , as well . Either through direct ingestion , or as pigs will eat anything, through ingestion of the corpse of the deceased rat .As much, as you may not like the idea .
Leptospirosis, accounted for several deaths per year among the farming fraternity ( human pop.56,000)
I never had any real problems - because my pigs were in styes.
But how do you , as keepers of free ranging pigs , manage the problem of vermin . I have looked through this site , and don't see anywhere that it is mentioned . But note , that it must be a problem you all have , to a certain degree .