They can pretty much eat anything. I don't even give chocolate or meat to my pigs but I know lots of people that do.
I tried googling what you asked and can't find anything.....it says not to give to guinea pigs.
I would be worried it might make meat taste weird though if you give too much and depends for how long and when in its stage of growing if you are raising the pigs for meat.
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Google gave me same info ha guines pig Nothing for pigs though? I just have some left over from my garden so maybe one time wont hurt Thanks a bunch