When you look at it from a pig point of view it's not that important how they have been fed. Pigs are getting into whatever they can find so their stomach can handle different things without problems. We humans might have our preferences for example we don't want anything that is fed GMO's.

Handling is something we take into consideration but normally we get pigs at 8-10 weeks old so they are much easier to train. We get them in spring and butcher before the severe cold sets in, which is roughly somewhere between november and february.

Age is a big issue right now because when it's time to butcher they need to have gained quite a bit of weight (with a healthy diet). If we were to buy anything at 8 weeks old there is no way he or she would have gained enough weight, meaning he or she would be left behind. A pig alone is a no-no.
This time we will look for anything between 4-7 months.