We have about 25 chickens all together; one big red roo, two bantem Roos, and the rest hens, one is a bantem. They are a mix of reds, americuanas, wyandottes, buff orpingtons, and white rhode islands. We have 4 acres in the middle of about 20 acres. Some of our girls are wandering off and our egg supply has decreased. We just let them free range in the summer with scratch grain now and then. Half the hens are 2 yrs old and the other are 1. I'm worried some of our older girls aren't laying and/or laying somewhere else. Should we feed them more? Put out more nesting boxes? Retire our older girls? Any advice or ideas will be much appreciated!