I have 2 coops of chickens, 1 coop has my little over a year old laying hens, then the other coop has my 19 week olds. The 19 week olds have started laying, in fact I had 2 little eggs out there this morning. My question is when can I open up the wall between the 2 coops and let all the chickens live together? My older chickens have layer pellets in their coop, along with oyster shell. The younger chickens have grower in theirs. Can the younger ones eat the layer pellets and oyster shell and can the older ones eat the grower? I was told that if a younger chicken eats the layer pellets they can 'blow out'? (the feed store told me this). Not sure what this means, but I don't think I want a blown out chicken. PS...I have 2 Marans that have started laying, they have already been moved into the big girl coop, and out of the 25 younger girls I really don't have any idea who is laying, have gotten several brown, a few white eggs and a lovely pink egg. I don't know if this helps, but I have Buff Orpingtons, Barred Rocks, Leghorns, Light Brown Leghorns, Silver Laced Wyandottes, Easter Eggers, Naked Necks and Speckled Suxxex. Thanks everyone!