That's interesting. Always seemed to me I got the most "gut" - or potbellies - when I had them on little to no grain and just pasture or poor quality hay. But then again, there's always a few that make you scratch your head. Had one heifer that I pushed really hard (she's 1100lbs and 15 months) and while I wouldn't say she has a potbelly, she does have a weak topline and so she certainly "sags". I'm hoping that'll tighten up with a little more age. Her dam has a strong topline so I have to attribute it to something about the way I raised her. Can't help but wonder if it had to do with the fact that I kept her on a lot of corn and she was/is FAT.
And then I have a couple 5wts that I acquired at about 150, maybe 200lbs. They've only been getting grained at ~3lbs/hd/day all winter and some stemmy hay. Didn't feel like pushing them too fast or spending a lot of money on feed, and they look really nice. No pot belly on them. Prolly only got a 1.5 to 1.8lb/day gain on them though; have to pull out the calculator and check.
Have some that are slightly heavier (6wts) that are still on the nurse cow; I've gotten about a 2.03lb ADG on them, and they also look really nice. Cow's not milking real well, calves not creep fed, and while the calves don't carry a lot of fat, they're balanced and they've grown frame. I can put the fat on later with a good grain ration, but I'm pleased with the way they've grown. These 6wts are actually the same age as the 5wts, both groups look nice but the ones on the cow are just a touch heavier.
You ever notice that calves that aren't fed quite right may be stunted in weight, but if they've been fed that way for a long time their conformation is normal? No potbelly. Sometimes they'll look a little lighter boned, but otherwise you'd never guess that 400lb holstein heifer was actually 11 months old! :shock:
Based on what I've seen with some of the ones I've raised, I'm trying an experiment on a group of 200-300lb holstein calves. I'm going to try growing frame and not let them put on fat or excess weight. I want to see them grow UP, not out. And have very little fat cover over the topline or brisket. I want good gains but I don't want them fat. Right now they're on 3.5lbs/hd/day in a grain mix, plus free access to our alfalfa hay field. Calves that size don't even make a dent in the growing hay, LOL. I'd like to see them at 450-500lbs by mid August.
I figure cows are cows. You might be getting higher gains off your beef stock than I get off my dairy stock (well, I know you're getting better gains, LOL) but when comparing ADGs, I think we're sort of looking at similar things. So maybe I see a .5lb increase in ADG when I feed "x", and for me that brings the calves to a 2.5 ADG. For you that might make it 4lb ADG. But increases and decreases in weight gain...we're still talking about similar things, your numbers are just higher than mine. lol.