My word, every time I come on here, I remember why I don't come on here more often, lol.
We have some kunes we got for free, mainly to help out someone who had them as 'house pigs' and was then distraught when they grew big enough to eat the sofa. We took them as we had the space and believing them 'grazing pigs', thought it would cost us nothing.
Well, that has not quite been true. We have had to supplement their feed, and in winter they didn't want to touch hay and had to have commercial feed and so on. The rest of the time they have thrived on grass and waste veg from the market with a small amount of feed to top up. I would guess they are around the 120kg live weight mark now and have each delivered us a couple of litters of kune/manga crosses (averaging 10/litter) which have sold at £55 each and the ones we kept have been splendid. (have six still available from current litters - please PM if interested).
We breed pigs from the point-of-view of making salumi and charcuterie first, and selling off surplus second. Kunes are super little pigs. Delicious meat, very inexpensive to slow-rear, very manageable. If your aim is producing white pork in the shortest timeframe possible then I can see it is probably not the pig for you.