I don't use ACV for worming. I'm not convinced it works, and when I actually saw my 6 month old roo poop a pile of worms
I was too grossed out to try it. - ACV is not easy to find and it's expensive. It works for keeping down some bacteria and slime in water containers, but I'm not convinced of anything else, yes, I'll admit it - I need a University study to back it up....
I go to the feed store or
tractor supply and buy the Ivermectin pour on for cattle. The dosage on the bottle is 1ml (same as a cc) per 22lbs of body weight. So divide that by say, a 4lb bird and you get 1/4cc per bird. Basically, I just put a small drop at the base of the neck. - And, it kills external parasites too.
I rotate wormers to prevent them from developing immunity. So, every other time, I use Valbazen (ordered it online, first state vet supply) and the directions are on the bottle.
After I wormed the first time, my birds gained nicely. I worm 2x a year, mid fall (Valbazen) and mid spring (Ivermectin, to kill winter lice/mites)....
And likely, everyone on BYC will do it just a little different