Where you read that, she's talking about the 1% stuff.
For the 5% stuff, it's still higher than the site I gave you. Maybe split the difference.
"The minimum effective dose for Pour On Ivermectin is 0.5 mg/kg, which is 0.045 ml per pound. This is given topically only.
A five-pound hen would...
I think you have it though. .10 ml for your 5.5 lb bird. That's two drops using an eye dropper. Mine are half yours, so I was right to go with one drop, ie. .05 ml
Without doing the math as I sux at that, I just took this statement: So if your bird weighs 2 kilos the dosage would be just less than 2 drops!
My silkies weigh about 2-3 lbs, so about 1 kg, so they'd get 1 drop which is 0.05ml.
Your birds weigh twice what mine do, so wouldn't they get 2...
We did our silkies with that and I took it from this site:
https://bitchinchickens.com/2019/04/29/ivermectin-for-parasite-control/
I used one eye dropper drop on the back of my silkies. I spread the feathers to get it on their skin. We did it at night in the coop, one at a time. We repeated...