When I bonded Hywel, Nerys wouldn't accpet him straight away and I had some minor scuffles until they'd sorted themselves out. Interestingly, it was nerys who backed down once she realised she couldn't browbeat Hywel.Don't worry about size! She'll probably insist on calling the shots until he is old enough, but that is a dominance and not an acceptance issue and you have to let them work it out between them. Acceptance happens before the dominance phase.
If there is mutual interest, I would think that you are in with a very good chance. I would keep piggies with severe teeth chattering and other signs of major aggression that can lead up to a bloody fight away from each other as things will probably not work out at that time; as I say, a minor bout during intro can happen when boar goes overboard and girl has to be a bit more forceful in telling him off. But that usually happens after the initial acceptance and is much milder in intensity. A sow that goes straight for a boar as soon as he tries it on won't bond.
The sows who won't accept a boar are mostly dominant older sows past ideal pup bearing age or some ex breeder sows who must have had a really bad time having been thrown together with several boars at the same time. Most girls up to two years and non dominant older sows have no problems with a boar.
The age of a boar is irrelevant. My first sow/neutered boar bond was between 3 1/2 year old Dizzy and 12 month old Llewelyn, and they simply adored each other. She would insist on teaching him proper manners, though!
Still as loved up as ever x) they are in a bigger hutch now, you wouldn't think it though, still snuggle up together every night.thanks lynz how are cherry and dodge?