Converting old alfafa stand into pasture.

So we purchased a property last year and 4.5 acres of it is in alfalfa, its in its 6th year this season and I don't want it cut and our nutrients hauled off. What is the best way to covert back into pasture? I want to fence it with barb wire and just run cattle but I am not sure if there is a way around the bloat issue, would goats or sheep be advisable? Though fencing is a big cost for the smaller ruminates vs just barb for cows. Any input on what you have done would be great.