posted 3 years ago
High tensile isn't recommended for keeping pigs in or keeping feral hogs out because they will root around the edges of the fence, eventually piling soil on the lowest wire, grounding it out. If the wire is too high for them to do that, they'll be able to get under it.
I've kept pigs contained in paddocks with a single strand of wire, after they were thoroughly trained to electric fencing, but eventually they figure out that they can bury it and go on an adventure. I would say 3 wires is the lowest you would want to go, but the perimeter needs to be inspected nearly daily to ensure it isn't being grounded out.