I only know one person who raises their own pigs. They send them off to be butchered properly and say that it costs them around $1 kilo, thats sliced diced and minced. They end up giving a lot away as they get around 140kg a pig. I think they are mostly self sufficient as far as feed goes as well.
Another thing to consider is that they will poop a lot and is a very valuable contributor to the well being of the vegie patch.
Not much I know, but hope it helps.
Township of Boonah (pop 3,000)
2.7 acres of gently sloping volcanic soil
"Progress is a spiral; the pendulum swings back as well as forward. The new postindustrial world, for which many of us are striving, will see an ecological renaissance".... Rober Hart