I was on a bus tour to Ray Bannisters a few years ago. He also gave a talk here a few years ago at the Ranchers Workshop. His system is quite controversal, most college proffessors and conservation people do not exactly agree with him but are willing to watch. We only spent about 1 1/2 hours on his ranch so I know but little about his operation. Looked to me like he didn't have that many pastures, but thay may have been quite large, he made the comment that he didn't have very good fences but that they were just boundery markers.
I believe he uses fairly long grazing periods but grazes very extensivly, forcing cattle to eat the Western snowberry, sage brush, buck brush, and other plants that cattle ordinarly refuse to eat, Then he will rest his pastures for about 26 months. He had mostly Herford cattle or at least English breeds, something that can get by on low maintainance rations. He said he could produce calves for $35 cwt. I don't know his land cost, but I doubt many of us could say that. I believe he also farms some, I think he mentioned rotating with sweet clover. He was asked why he didn't run cattle on all his land, and not farm, but he didn't answer that question.
The guy is quite a talker, but he wasn't trying to sell his program or his idea, just tried to get people to think outside of the box. He believes cows can be trained to eat certain plants that they might otherwise refuse. He also pointed out that trees and brush might produce more forage than our grasses
For what it is worth. from my observations, I find yearling are less selective on what they graze than cows. But, I also believe cows and calves are more successful when used on extensive grazing systems than yearlings.