Some of my Silkie hens are a litte "shabby" looking. I've had them locked up in the chicken house for the last 2 weeks because I was working on their new run & it wasn't secure, before that they were sharing space with a few roos who proceeded to pull some of their head feathers out. Plus, some of them are going through molting & I just got through battling chicken lice - I think I won that battle. Right now they are on layer chicken crumbles, cracked corn, & plenty of fresh air & grass (at least until they kill it all). Someone suggested I feed them Biotin which is a suppliment for horses to improve hoof & hair growth. Anybody have any suggestions?