I've got 35 chickens and I'm only getting 12 eggs per day. I have no idea what is going on. We had gotten up to 19 eggs in one day for a couple of days and then it dropped to 10! My girls are 29 weeks old and are a mix of Black Australorps, Americanas, Dominiques, Partridge Rocks, Buff Rocks, Buff Orpingtons, Golden Laced Wyandottes & Red Sex Links. They are free ranging from 8 am til dark. They are fed layer ration and oyster shell and occasionally scratch grains. I also started crushing their used egg shells and feeding them to them (which they LOVE). What am I missing? They all seem very healthy and are very active. The henhouse is clean. The water is clean. They don't want for anything that I can tell. It seems like we should be getting 25 to 30 eggs per day. Are my expectations too high?