Knowing the poisonous plants in your area is key also. I nearly lost one a few years ago when he found a patch of bracken fern and developed a taste for it. He started showing signs of polio and I had to give him countless Thiamine injections to get him through it (and we got lucky). I ended up...
We have used a similar approach for rotational browse for a few years now. The only difference in our setup was the use of polywire instead of steel wire. We've used countless trees but also T-posts for corners and the little step in plastic insulator poles for greater distances. It has worked...