Argentina is famous for the production of beef. The steers are grass fed, simply left in the fields and on their own until ready for market, then rounded up and processed. I have been told by people in the business that there is no feed lot, no "fattening up" to get a better price and no hormone treatments etc., which is why the meat is so lean and tastes so good.
There are many working ranches that allow visitors to see just how they do things and some actually allow guests to help out with work around the ranch and will provide room and meals etc - like a hotel for ranch-hands.
You can ride the trails, drive the herds to new pasture, live the life of a real vaquero. Great fun if you have the time to do it