Hi Andrew...
We use single or double strand electric polywire and
solar chargers. Most years we buy in our young stock. When we do we give them a balanced grain ration that is sufficient
enough to feed a little bugger. We never increase their grain ration. They have to go find their food. Some times we've "hogged down" a standing crop of rye (if the grass quits on us).
PIgs finish on hazelnuts, apples and chestnuts. After the harvest of any other crop, the
cattle are moved in first, then the pigs. Yes... This topic is addressed in Restoration Agriculture:
http://www.forestag.com/book.html