Working estancia

I'm back in Brazil for the summer and I'd like to go  to Uruguay and travel around the cow country down there.I'd realy like to stay on a working ranch and get to be part of the daily operations.I'm familiar with ranch work so I'm looking for the real deal,I need a place where I'll work just like one of the hired hands.I know that's not a travel blog ,but I haven't find anything on my research and I figured I'd have a better chance with people living in Urugay.If anyone know a place where I could say please let me know.
Thanks,
J.O.