Ivermectin is not approved for poultry in the US. Most medications are not approved, so we have to weigh why we would need to use it since it leaves a residue in the eggs, causing us to have to not use them for specific periods. FARAD is the organization that tells us if a medicine is approved or not, and you can always contact them with questions. Not many recent studies have been done on drugs when they are not approved by FARAD, but you may have some old studies you can find online.
Scaly leg mites can be controlled by applying oil such as vaseline, castor oil, mineral oil, etc to the legs and feet to smother the mites. Body lice or mites are normally treated with permethrin spray or the garden dust, sulfur powder, or Elector PSP. Worms may be treated with either Valbazen or SafeGuard/fenbendazole liquid goat wormer or horse paste, and have a 14 day egg withdrawal time after the last treatment. The only thing I believe that might require ivermectin is feather mites and rare scaly face mites. The latter can also be treated with the mild alternative, vaseline.
So when looking for info online, make sure that you are reading links that are from reputable sources, such as a vet college poultry expert or something like the Merck Vet Manual, The Poultry Site, and major universities. Poultry DVM, is not any named person or vet, just an anonymous website. Some of their info is okay, and accurate, but some of it a few years ago was inaccurate. They have improved. I have a suspicion that they also read BYC threads for some info. When you read something here, try to find a well known qualified source to back it up. This is all just my opinion.
