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I do know that you can't grow the trees in the normal world, so I doubt that the mobs would work, but that is definitely somethig to try with a mystcraft portal.
atm shards work on vanilla mobs & are not cross mod compatible I did read on his MC forum page that in the future maybe it will be, seek & you shall find, but that said from last update TC mobs "angry zombie" souls can be captured.
Use Transformation Powder on a OW sheep to turn into a goat "ram I beleave" then you should be able to breed but I have not tested that yet..works on sheep/cow/chicken/villagers..