Separating young boar from his mates?

Hi pig people--

First time pig owner here (as you may deduce from all of the questions I've been posting). We have four piglets, a young boar and half-sister gilt, 5.5 months old, and brother-sister barrow and gilt, 4 months old. The boar was already 3 months old when we got him, and between his already being pretty big and reading more about how boar taint can be managed via feed and pasturing, we did not attempt to castrate him. (The barrow was already castrated when we bought him, due to being the result of an accidental father-daughter mating).

So the problem is, we now have a super horny teenage boy of a pig, and he is mounting everyone and everything. His pen-mates seem to be very frustrated and annoyed by this behavior, and while we are thinking of breeding the gilts, we don't want to do it till they grow more. It seems like our options are to either separate him from the others, potentially leaving him lonely; or pay a vet to come and castrate him despite his advanced age (expensive and painful healing, I suspect). To me, separating them seems like the best option, but I'm concerned about him becoming depressed and lonely, as I have seen some other solitary pigs. We could divide the pen with an internal fence of wood or hog panel, which might help him still feel like part of the gang, but then I'm thinking he will just bust the fence down. We could put him with the barrow, but he tries to mount the barrow as much as he does the girls, so that would be stressful for the little guy.

We just had a perimeter fence completed around our little orchard, so that they can start to forage and play outside. Would simply having more space help relieve the behavior? He seems (ahem) "motivated" so I'm doubtful.

I'm doing additional research online and in our pig guides, but any suggestions are most welcome. Thanks!

I suggest putting him in a pen with the barrow.  He may annoy the little guy but he won't get him preggers... If you try putting him alone he will figure out a way to get to the others. Give him a buddy , who will eventually get tired of being mounted and bite back... he will also soon grow to nearly the same size. I can tell you that all piggys will mount each other regardless of sex and quickly learn to turn & bite to make it stop. I do not breed , I only raise wieners to slaughter so the others may have better ways of dealing with him.  

hau Kim, congratulations on becoming hog owners.

As Thomas brings up, put the barrow (a cut shoat) and the shoat (an under 8 month old boy) into their own pen.
hogs are herd animals, they want to be in a group and if they aren't they will find a way to be with others of their kind.

Boy hogs don't become able to impregnate a female until they are around 8 months old, so if he is younger than that, he is learning what his job will end up being. (consider that what he is doing now is pre adult play learning)

By separating the boys from the girls you will have better control of all your hogs and you won't have to worry about line breeding by accident.

keep all hogs away from any trees you want to grow, and keep them out of your garden areas.
I like to use hog panels, you need posts every 4 feet (for when the hogs get larger, they are very powerful animals) and make sure the fence is on the same side of the post as the hogs are.

Redhawk

I'm having similar issue except I'm moving across the country. I dint know who to take I have 4 girls and a boy. One of them is pregnant by him.  I dint know who to take with me. The pregnant one,  her baby, and one of girls or the father but def get him fix? Or should I take the Mama, baby.and one of the girls that she stay close to . I dint know.  I def keep Mama, the baby and will get them fix.  Just don't know who else I take father fix him . Help 😔