The answer to that is the carcass data in question was supplied by the fact that over 60% of fat cattle back then graded choice or higher.
Yeah, with a yield grade of 7
I know it don't go that low now, they had to add a couple more grades, for them fat little suckers back then :lol: about enough meat on the carcass for 1 big mac. Efficiency at its very best.
As far as performance goes, if you put a smaller framed, thicker made cow on better rations she will usually produce more. Try putting a larger framed horsey modern cow on lesser rations and see what you get. A train wreck most likely.
I'm not sure why you would associate large, hard doing cows with a modern day Hereford breeder who likes to show a little :lol:
Cow pictured below was raised and fed some grain, she was a show calf prospect. I decided not to show her. In the picture she about 4 years old, she had just had her second calf, maybe 2 days earlier, she had not seen any grain in about two and a half years, except every now and then I would take a bucket out, to move them, or call them up and feed them some just for fun. Oh! shes about a 5.8 frame
This cow was raised on grass, she did see some grain when she was weaned, I think it helps them get through that stressfull time a little easier with a liitle something in their belly. Picture is from this fall, she will calve again this spring. [I hope] I had her in there, baby sitting the bull, while I had heifers in a lot close by that I wanted to AI. Shes a 6 frame
I do have some older cows that are probably 7 frames, one of them is the mother of the cow above.
I was just using pics that I had uploaded a while back, and found this one, the mother of the cow pictured above. She probably a seven frame, and lives on grass and hay like the rest of my cows.
Anyway my point is, that not all breeders who like the newer, showy type cattle like me, want hard doing, big framed, horsey modern train wrecks