Yes, restricted activity means less feed used for, well, activity, and typically greater fat content.
I can't recommend commercial confinement standards. The "seem" too small for me, regardless of their success commerically. But that's a wholly unscientific position I hold, one of pure...
Theory is good, I would defer to @MysteryChicken 's far greater experience, but we are in agreement here. When theory and experience align, good sign you've bumped into a pretty firm rule.
Because ORPs build skeleton first, then start to bulk, I simply wouldn't consider them table birds. By the time they start to bulk up, the meat is already moved past fryer and broiler and is already firmly in roaster, maybe leaning towards stock, stew, and sausage options. of course, you can...
Will it help? yes. Noticeably/cost effectively? I can't speak to Orps specifically, because I've never raised them. In terms of my own mutts, faster growing than Orps? Its still very hard to justify.
The typical means of fattening up a bird is adding calories and fats - corn. If you look...