It was cool to learn you can feed industrial made crumbles to chicks in a pinch.
Checking the label is always a good idea.
If the feeding instrucations say "feed from hatch until [some age]" then it is designed for chicks and should be fine.
If it says "starter crumbles" or "chick feed crumbles" or any such label, it is probably meant for chicks from the time they hatch, although checking the feeding instructions is a good way to be sure.
I could have sworn the grower crumbles from this company had flecks of corn and wheat in it. Not huge ones, but much bigger than the chick starter. It makes sense because they say not feed their crumble to chicks until they are some number of weeks old, I just naively thought it was the same across the board.
That seems really weird to me, because just about every chick starter I can find says "crumbles" right on the bag or the description. That has been true every time I looked, for quite a lot of years.
Examples from the
Tractor Supply website:
Purina Start & Grow crumbles
Purina Organic Starter/Grower crumbles
Nutrena Naturewise Starter Grower crumbles
Nature's Best Organic Chick Starter/Grower crumbles
Dumor Chick Starter/Grower doesn't say "crumbles" where I can see it on the website, but I've bought it before and it is too. They ground everything small (like flour), then made it into crumbles that are bigger than grains of flour but small enough for chicks to eat.
Some grower feeds have less protein than starter feeds, so they say not to feed to younger chicks because they don't have enough protein for the first weeks. So I don't know whether the one you experienced was saying it because of the piece size, or because of the nutritional content (protein or something else.)