No offence but chickens aren't the same as parrots, they may still be a bird but they have evolved differently.
Regardless of which, even if it was specific to parrots I still wouldn't feel 100% safe, just because there are no known links doesn't mean there are no risks, look at any human medicine and there is always a list of possible side effects but parrots cannot tell us unless it is a serious side effect. I prefer not to medicate with toxins unless necessary, like I said wormers were created as a treatment originally, not a preventative and their overuse is meaning parasites are forming resistance to them.
It would be like giving a rabies vaccine to a child just in case it ever entered the UK again, absolutely pointless unless there is a high enough risk. The risk of a indoor companion parrots contracting worms is pretty low in most countries, why give the bird a toxin when there is a simple, none invasive test available at ZERO risk to the bird to see if its needed in the first place?
As I said, I respect your opinion and for all i know you do live in a higher risk country. I just like to cover all sides of things.




