Regarding ivermectin and lice... For years I've been telling people that it doesn't work, but my peafowl buddies kept insisting that it worked for them, so I thought I try it again. Two weeks ago I treated one peacock and three chicken hens. The next day the peacock's lice were gone, and the following day the three hens were clean. Today I tried it again... hen is 2.5 kg and was given 1.87 mg (1/10 cc of ivermectin horse paste). All doses were ivermectin paste, so all were given orally.
I've used the Ivermectin horse paste on my hens for 5 years topically every 3 to 4 months under each wing on the skin - one drop per pound of bird weight. Each year a fecal vet taste has shown negative for internal parasites and I've never had a case of lice or mites either. I also use Rooster Booster Multi-Wormer supplement 5 days a month with regular Rooster Booster vitamin supplement every day, and use organic enzyme Manna Pro Poultry Protector spray on hens and on coop crevices and perches at least once a month for lice/mite preventation. I have 4 hens only so this maintenance routine works for me. I know the Poultry Protector works for lice and Manna Pro also makes a mite spray too. I received a couple juveniles in shipment that had lice and one treatment of Poultry Protector and the lice were not visible immediately. Still, I treated a couple more days just to be sure with a followup spraying a week later for any eggs that might've hatched in between treatments. The directions are detailed on the label and can be used on chicks too. Many poo-poo the idea of using Ivermectin horse paste but it and Poultry Protector and Rooster Booster products have worked for me for 5 years total. I never tried Ivermectin orally w/chickens as I am not experienced enough to guess stuff like that and I preferred using products approved by the FDA first where no egg withdrawal was necessary. Egg withdrawal is necessary if Ivermectin is used so I apply it whenever a chicken is not in a laying cycle and not during molting or illness either. Kathy, as always, I appreciate your posts!