Hi Vida, your trees look like mine.
I have two golly balls, a stall treat thing, big ball in pasture free choice hay, mineral block. We took some bailer twine and braided togeather and hung from the trees but my almost two (in may) still likes to mess with the tree's. I have that rope fencing and the strands I don't have hotted we like to take our lips and pull the fencing and let it go just being a child, I am just facing the fact it's a young thing. After reading everyone elses stories. But let me know if ya have any more ideas.