I've discovered lice on a lot of my chickens and I have some questions on treatment options. The last time I had to deal with this I just had chickens and dusted them with a permethrin powder for 3 treatments ten days apart each treatment with success. Now my neighbors have brought home a nasty old rooster a little while ago and ended up infecting their whole flock and my free range mixed flock. So now I have to treat a lot of bantam and standard chickens, 8 turkeys and 4 peafowl. Plus I have 4 ducks which I don't think have it but should I treat anyway? I have everybody locked up for treatments. They will all be dusted tomorrow, but I also have some pour-on Ivomec for cattle and I've read that some people use that to treat lice in poultry. Two of the peas and four of the turkeys hate me so I was wondering if the ivermectin pour-on would be effective or even safe on them and if it would continue to work for a few weeks. A couple of my turkeys started laying in late January. Would Ivermectin affect egg hatchability? Are there any other treatments I can consider that might leave an active residue to continually treat the birds? I have a large flock and my neighbors are kinda lazy about it so I'll probably have to help treat their flock as well.