This is an older thread. I had my first flock around 50 years ago. Luckily I didn't have many problems back then. It just been the last few years where I experienced more issues. My birds, and I have a few hundred, never had mange but have had mites and lice. Ivermectin isn't approved for poultry the last time I checked but permethrin is and has worked for me. Same program weekly treatments for 3 or 4 weeks and there is no egg withdrawal period. Good luck...