I am wondering how close is too close of a relation for breeding. I have a boar and a sow from the same sow, but from different litters with different sires. Are they too close to be bred? The boar broke out and got into a pen with her so I don't know if I should call the vet and see about aborting. I know line breeding is a common practice but I don't know enough about it to now if this could be a problem. Thanks!!

Not a problem.