We used to keep the boar with the sow until it was time to move her on her own. The latest is a bit of a wimp, Hilary made his life a misery, she used him as a live fence tester. Eventually she must have pushed too hard because he ended up on the outside. He took himself off to a pen of gilts where he was very happy (and I wasnt). Hence my costings of the boar, cost versus convenience.