[member=199882]Splodge64[/member] I note you only joined forum in Feb 20 so I should like to say welcome. I don't know the answer to your Q and piggy folk here are seemingly not sure either (given lack of replies so far).
As it's now 2 and bit weeks on: what did you decide to do - did you let the pigs run?
(As a non-piggy person, I would guess it would be OK: pigs are not the most discerning of eaters and I imagine their stomachs can cope with most things including potentially old beech mast - but, clearly, I don't actually know.)