We've got about 200 rare breed chickens...everything from auracanas to polish to Marans to buckeyes to cochins. About 40 of them are older chickens, two and three years old. The rest are young chickens we got last April, May, and June. We have four roosters. We're getting 18 to 20 eggs a day. So about 160-170 chickens are not laying. Anybody got any ideas why a whole bunch of new chickens won't lay?