I am totally stumped here. I have 15 hens of varying ages. The oldest are 4, the youngest are a little over 1 year old. The older girls had slowed down in egg production but the younger girls were laying regularly. Located in Indiana. They have a large coop and pen. They eat organic feed and get fruits and vegetables. I give them scratch and corn for treats but not every day. They appear healthy, no one is broody. All was fine until I changed their nesting boxes. They had 6 open boxes and I switched them out for a 6 hole metal covered nesting box. Now they are on strike and have not laid an egg since. It has been two weeks. I put a couple of fake eggs in the boxes but they didn't fall for that. I have seen a few of them in the boxes but they don't lay. Whats up?