Are you sure about this? I thought the commercial and the byc layer feed is the same if its from same factory /same brand. And the producers only put the byc feed in bags and not in a silo.
Complicated answer. "Maybe". I live in "chicken country" SE US. We have a number of local mills.
I can go to the farm store and get Purena, Producers Pride, Dumor, Nutrina, etc and could order in Kalmbach and a handful of others. None of the commercial operations are using any of those feeds.
I can go to the local feed store and get feed from one of several local mills. Tucker Milling and Harrell Milling Company have most of the business around here. I buy in 50# bags. I could buy by the ton. Several smaller (independent) commercial poultry operations tend to do just that. But if you produce eggs or birds under contract to one of the big names (ConAgra, Pilgrims, Southern Pride, etc), you use their hens, in conditions meeting their specifications, using their feed, manufactured and tested to their specifications - which isn't sold for use by the rest of us.