[Paumon]

You forgot to mention whether or not you're going to be living there or at least spending time working there every day. You also never mentioned what kind of safe shelter, proper food and health care you plan to be providing the animals with.

Nothing can survive on just spruce alone, it's too acidic and they'll quickly become malnourished and susceptible to organ diseases and digestive diseases like scours and both internal and external parasites. The fact that there are so many coniferous trees on the island means the soil is highly acidic and the only other plants that will grow there are also acidic plants and other toxic or non-nourishing plants. That's not good for pigs or goats. The pigs won't thrive and will injure then kill and eat any other animals stuck on the island and competing with them for food. Yes, even the goats will be at risk from being hunted and eaten by the pigs.

If you're going to be living there or at least working there every day and giving them healthy supplemental food besides spruce then the chances of domestic animals surviving might work. But you have to be there.

If your plan is to abandon them there alone with no safe, sound shelter, no healthy daily food supplements and no health care or daily attention from you they won't be safe and they'll likely be gone inside of a couple of months at the most. They'll be gone from attrition and malnutrition or poaching or theft by the most dangerous predator of all.

As soon as word gets around (and it will, you can count on it that it won't take long) that somebody has stranded some domestic animals on an island and left them there all alone and running loose then other people will come and take them.

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[Paumon]

I would never do that, I was comparing the quality life to a pig in an industrial operation to that of 2 or 3 having their own 6 acre island to call their 'pen'. I was trying to imply Animal Control/DNR should have no reasonable issue by comparison... Taking the 1000+lb of feed over to raise a couple of pigs(presuming they could forage some) might still be worth it.

Forget about the quality of life of animals in industrial operations. There is no comparison and no quality of life to speak of for either the industrial animals or the abandoned and neglected animals stranded on a rock sticking up out of a lake.

You'd definitely need to provide the animals with food if you want them to grow to a healthy harvestable size and weight before winter. They wouldn't be able to forage for much of anything worthy on a solid rock island with a thin crust of acid soil and shallow rooted acid plants/trees. That's all those lake islands are. Just rocks sticking up out of the water with some sour plants and trees struggling to survive on the surface of them. You can't even grow anything worthwhile on those islands because of the poor soil quality (what little of it is there) unless you bring in tons of your own gardening soil and amendments.

But if you aren't going to be there to ensure their daily safety and welfare and plan to only check on them every few weeks then in all probability your very biggest problem is going to be other people. How are you going to prevent raiders from coming to the island and taking the animals? There's nothing you can do to keep raiders off your island. None of the raiders are going to be sympathetic towards you for leaving the animals stranded and unattended. The raiders' only sympathies will be with the animals or with themselves and their own bellies. You won't be able to report the trespassing and thefts to any authorities without getting yourself into a lot worse trouble with the law for domestic animal neglect and abandonment. And you won't be able to replace the stolen animals without the new replacements being stolen as well.

I believe you are asking for a lot of trouble and expense and you need to do some more serious and practical thinking, research and planning about what to do with your 6 acres of uninhabitable private rock sticking up out of a lake.

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