junebuggena
Crowing
Do you only have a coop? No outdoor run? Could be a lack of daylight causing their slow development.
Actually, feeding layer to a flock with roosters and non laying birds is a problem. Granted they aren't going to keel over dead immediately, but the damage to the organs still happens. Just because a bird is over 18 weeks old, does not mean that it will be laying soon.Your Birds are over 18 weeks so the layer will not harm them...Best to have waited but not a 911....Start them on a grower now till your first egg...Cut down on treats and the Roosters could be stressing out the hens and that is why they have not laid eggs yet...
Cheers!