LateBirdFarms
Crowing
I believe you’re correct. From what i’ve heard from my personal vet and other chicken keepers is that scratch should never be a part of their daily nutritional intake. they shouldn’t be consuming more than 10% of their daily food intake in scratch. i feed mine a little more scratch than usual in the winter, right before bedtime to help them stay warm in the coop. but even a pellet specifically made for laying hens sometimes doesn’t have enough calcium. offer them oyster shell. they know when they need it! mine especially LOVE their old egg shells. i save them from when i eat their eggs and feed it back to them as smaller pieces. you would think i’m throwing candy to them. it’s crazy!
My confusion over the scratch is mostly out of my uncertainty about American brands and labeling. My feed store bags are never as pretty or inviting as the American ones, so without seeing the description or the actual mix, I'm reluctant to weigh in

Scratch around my place is an evening staple in the winter, usually mixed with a bit higher cracked corn than most would suggest, but just a handful goes miles in keeping those little furnaces running efficiently in a coop when the nighttime temps are below -15c. But it's not something I would ever suggest feeding as a daily ration unless in a dire situation where nothing else is available.