Okay, I have some 11 month old hens, (BO, BR, RIR, Red Star, Cochin mutt) that have laid like little workaholics since they were 20 weeks old. In the last 2 weeks egg production is WAY down. I get about 2 eggs a day from 6 hens, different ones on different days so no one in particular has stopped completely. In the past none have ever skipped more than one day. All are in robust health, not broody and not moulting. No evidence of mites or worms. Nothing is different in their diet or routine. I don't think they are old enough for a slow down. Any ideas?