My chickens are molting and look pretty scraggly. Some of them have patches of new feathers coming in, some of them have bald spots, and some are just losing feathers here and there. Questions: 1. How long do they molt? 2. Is there something I should do to boost their nutrition during molt? 3. I have noticed a sharp decline in egg production which I believe is normal, considering the stress of molting-but I have also noticed some misshapen eggs and 1 "leather" egg with no shell, even though I supplement with oyster shell. Your advice please.