I have a flock of 7 chickens. One Rhode Island Red, four Isa Brown, one Amber Link and a Seabright Bantam. I got them all at the same time and they've all been together. They are 1 1/2 years old. Last fall they began eating their own eggs. This we made it so the eggs exited the coop and they couldn't do it anymore. Now I notice I'm getting a deformed egg each day, they shell is soft and easily breakable on one side. I also get one with a meat spot everyday. I have no idea who is laying these but I suspect the Isa Browns. They went through a rough winter last year but all survived. I wonder if this shortened their laying span. What to do with these birds? What does everyone do in the long-term with their hens when they aren't laying well anymore? How long do they usually lay in their life? Thanks!