I have 2 bantam cochins they are the about 9 months old. They have been steady layers for a while now and all of a sudden they stopped laying. One of them turned aggressive and was showing signs of broodiness. The same one also is loosing feathers. I have a leghorn that is a little over a year and she is still laying just fine. I live in the phoenix area and the days are still in the upper 80's. What could be going on with my cochins?