My flock looks terrible. They have not molted for the first time yet and they are over 26 months old now. Hens are partly bald from treading roosters which are now removed. Two broody hens I segregated have new feathers on their backs and you can really tell how faded and damaged the old feathers are by comparison. What would be potential reasons why they will not molt? Is there a way to get them to molt before winter sets in?