I'm confused about Dumor feed that I get from Tractor Supply. We were feeding our what are now 16-week-old chickens Tractor Supply"s Dumor Chick Starter/Grower. The back of the sack shows three levels: A) Weeks 1-10 Starter/Grower 20% Protein. B) Weeks 10-18 Grower/Finisher 15% Protein C) Weeks 18 on Layer 16% Protein Because of what it said on the back of the sacks and what the sales clerk said, we've had them on B) Weeks 10-18 Grower/Finisher 15% Protein for about a month. I just now read on another post that they should be kept on Starter/Grower until they start laying and then be put on Layer. On another post it sounded like "Grower/Finisher" is strictly for meat birds. Is that right? Should I switch them back to A) Starter/Grower until they start laying?