If you want to use strip grazing, take a look at www.graziersystem.com they have the sturdiest portable fencing. I got the 50 foot round pen size and we used it to contain two horses when we first moved to NC so they could aclimmate to the grass. You can train in it (without the electric on) and I've used it as a single electric fence to portion off parts of fields.
Cherie
