First off, in almost every state (USA) it is illegal to let hogs (any breed) run free without some sort of perimeter
fence, the feral hog problem is huge and only getting larger.
Second, AGH, while very friendly and able to be tamed, are going to behave like any hog (it's all about the food and the wallow), they are going to make a wallow where there is
water, so if you want to keep your creek untouched you can't let them free range.
They are not going to come to a bell unless you are going to keep them penned up for at least two or three months while you train them to come to that bell.
By the way, the boar will develop nice tusks (three years to grow about 4 inches long) which are deadly weapons, especially during a sow in heat period, he is going to be very grumpy about anyone or anything getting near that sow.
I've been charged at once by our boar, it was my fault, one of our registered sows was in estrus at the time. That is a scary situation if you aren't armed or aren't on really good terms with him before hand.
I had to stiff arm him on the head and tell him "Adam, stop that, it's me, let me give you an ear rub buddy". Once I got to scratching behind his ear, he calmed down a bit, but I still backed to the gate and got out of their enclosure fast.
Most breeders (I am a registered breeder of AGH) use white electric tape ( three strands) as a temporary fence so they can move them around at least weekly, less moving them around means more rooting, something I use to my advantage.
Once they know about the hurt those white tapes bring them, they will avoid them.
I don't know of anyone that doesn't keep their AGH fenced in, all the time, mostly because of their state laws I'm sure.
I want to know where my hogs are all the time since hunting wild hogs is a 24/7 365 thing in most states now, if they got out, I'm out a breeder hog with no recourse.
These are pasture hogs, while they will eat some bushes, they prefer grasses for their food and they will eat
hay as long as it is tasty to them (tiff green is one hay my hogs love).
Do check the laws both state wide and
local before you think you can get away with free ranging hogs. Fines can be stiff.
Redhawk