I have a question about my Leghorn hens. I had several Leghorns shipped to me last year. They are laying well. I read on line that they seldom go broody, yet 3 of my 4 Leghorn hens have taken off, disappeared for awhile, and then shown back up with chicks in tow. My Rhode Island Red and Americana have never hatched chicks (except for 1 Americana hatched 3 chicks). Why do you think this is happening, when everything I read says they dont go broody?