He says he has cattle that do well on grass. They do not require grain to maintain. But I am not sure what kind of carcass you are getting. I looked up the carcass EPD's to see how they are doing on grass and nothing has been recorded in REA, IMF $B. When I start looking back further in the pedigree(way back in some), I start finding where the bloodlines had REA measurements. Some are in the negatives and below average. But they do pusch the tenderness gene and the ability to maintain their ability to maintain on grass.
I watched it of RFD-TV and saw many sloppy hips, rear legs, hocks and rear fetlocks. Some hips and rear legs were really bad that you could trace the bones lines and when the bulls walked, they swayed like a woman walking down a runway. I turned it off after the 15th bull.
Chuckie