Am worming chickens with Wazine in water this week and will do Ivomec(Ivermectin 1%,cattle/swine injectable,think oil based because it got all over me and is greasy!!)as next treatment BUT can not find dosage or answers on how to give to chickens most effectively. Does anyone KNOW if this Ivomec can be effectively applied topical OR oral and whats the dosage(topical would be easiest as I have 37 birds to treat) PLEASE-need help!!