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I dont recommend using ivomec products on chicks. It's primary purpose is a wormer (poison) that is placed on the skin and absorbed into the bloodstream, injected, or given orally in paste form. Chicks internal organs arnt fully develeped to handle ivomec products. To do so they risk internal damage to their organs, possibly death. I recommend you use sevin dust, adams products, or any other topical product that will prevent and/or kill lice/mites.
I wouldnt use ivomec products til they are over 6 months old. This also allows time for their egg making parts inside them to get properly adjusted to normal egg laying. Additionally there is a 2 week withdrawal period.