Hi Lea. It can take several months for the crusts to fall away.

Lea

Hi Deb. That’s an interesting question. I would never recommend it, but if they did get to some, it would probably be harmless unless they carry the MDR-1 mutation.

Hi Sherryl. Thanks for reading. The purpose of this article is to get chickens treated more effectively by using ivermectin. However the disadvantage of this is the extremely long time during which the ivermectin remains present in the eggs and meat. Too many people fail to consider the human health implications of treating their chickens. Therefore you need a vet to guide you, even if only via telephone, who is aware of your local laws.

Hi Trudy. Well done for asking about withholding periods especially in the COVID age of people taking the same drug at breathtakingly high doses. I always recommend a minimum two month withholding as a minimum but since the drug is unlicensed in chickens and residue levels have not been studied, four months is even better. By the way, I always repeat the second dose at two weeks as I think that by four weeks some of the hatched eggs are laying eggs themselves.
From my experience it only comes back if you introduce a new chicken who is a carrier, which is very easy to do.