We have a kune kune boar (soon to be two) just outside Banff if that is any interest to you?
Although slightly slower growing (we'd usually send pure kunes off at 10-14 months) they still achieve similar weights, and kunes have light bones so there is less loss from live weight to carcass. They are also better at grazing than most breeds and feed requirements are much less than other pigs, around 1/4 of the concentrates to slaughter weight. And they are very friendly pigs!
If you're interested in a covering, please pm for more details.