There can be many reasons for decreases in egg production from your chickens.
The Chicken Chick gives causes and solutions, click below to read the article:
http://www.the-chicken-chick.com/2012/12/decrease-in-egg-production-causes.html
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Wood Chicken Coop Rabbit Hen House Nest Huge Run Backyard Poultry Cage
Chickens In Your Backyard: A Beginner’s Guide