I have 4 hens just over 1yr old. They stopped laying in the heat of the TX summer and I did not worry about it. However they have not started again and hens in the past did. They have faded combs and are not laying, they have a crust around the outside of their vent, but the vent looks healthy and they aren't showing anyother signs. They are also not 'squating' when I reach for them as in the past. I am sure there is something wrong, but I can't figure out what it might be. Any ideas?