We mix layer crumbles and scratch grains 2:1. & they pick out scratch leaving layer behind. I tried pellets also with no success, same thing. All birds are free range from 6 a.m. til they decide to go in. They forage as they please on 2 acres. As it is cooling off and fewer bugs to eat, i would expect them to want the protien in layer?¿ Any thoughts? btw we are in central florida.