Originally posted by Polonius Ulf:

Crops grow, but boars do not reproduce. There should be something like a dungeon master that is responsible for calculating what plausibly happened while you were away. When Valheim is finished, the calculations it does will become more sophisticated. If the plants can grow, the pigs should reproduce.

I think it is an intended mechanic to keep you chained to them in order to reap the benefits from them....

For me it is enough so that I don't even bother anymore... the few times I did tame it was never worth the time investment or loss from attack etc.

If they bred normally and tamed when absent I would probably use them, the only possible use now I can fathom is if you are feeding an army or role playing as a farmer or something.