Hiya Loosey
Great to see someone else being "serious" about Kunes - would definately give them a thumbs-up for this idea
They are really hardy & will live outside for you all year round (no matter what the weather) as long as they have a dry, draught-free house & access to water. They will need somewhere for shade in the summer & will olove you for ever if you can provide them with a wallow
When the grass is growing over the spring/summer our adults have only about a pound of feed a day - unless they are in the latter stages of pregnancy or lactating. Don't overfeed, they run to fat very easily & can get feet problems - a bit like laminitis in ponies. You can keep 6 adults to an acre, allowing for rotation paddocking.
If you get them young & are able to spend some time with them they get REALLY friendly & will lay-down for tummy tickles - something I would advocate, as it makes them so easy to handle for any feet trimming, injections etc. If you get them used to a "call" for feed they will gallop across a field when you call them & follow you into a trailer if you have a bucket
They are grazing pigs, BUT, they can dig-up the ground - 2 of ours do & it doesn't matter what size of paddock/how much grass/feed they have - they just like to dig
Be careful to get pure-bred Kunes (if it's Kunes that you want) there are folks out there crossing them with other breeds - attempting to get "micros"
there are also plenty of genuine folk crossing them to get leaner porkers too. All litters have to be "birth notified" with the KK Society or they cannot be registered, ever.
Not sure what prices are like down your way, but up here registered breeding stock piglets are about £125-150 per head (folks will do deals for those wanting several piglets or just wanting them to rear for the freezer). They mature sexually very young, but don't make meat weights until about 8-10 months or so.
Keep us all posted with progress - You will get plenty of advice & support from folks on here