I have a flock of 8 chickens. 1 bantam rooster and 1 bantam hen, both were hatched in March 2012. Then I also have 6 standard sized hens, all were hatched in March 2011. The bantam hen is fine, she is laying well. The 6 big girls on the other hand, are not laying. I only have 1 hen laying out of all 6 hens. We get 1 egg every other day or so. I have no idea what is causing this. I have searched the coop and run to check for any eggs they could have hid, but didn't find any. I live in New England, and our weather has been nice and warm during the day (70's-80's). Everybody looks healthy, despite some not having neck feathers (likely due to feather pecking). They have plenty of run and coop space, but I have also been letting them free range a lot more during the day, to help with any boredom. They are on Dumor Layer pellets, and fresh water, with some occasionally table scraps every now and then. What could be causing my egg shortage? Are my 2 year old hens getting too old for laying?