I have checked my hens thoroughly for mites, and I don't see any. I did have a roo that did a lot of damage to them, many of them are completely bare-backed. I have noticed that several are growing new feathers. I'm thinking that my drop off of production is because it takes a lot of energy to grow feathers? I've got 14 hens, and we hit a new low the other day, only five eggs. Combs are nice and healthy red, they run around like little nuts at night, they seem healthy....could it be the regrowing of feathers?