Leave them all in the coop.I plan to, just trying to figure out the best method. I have 2 8 month old RIRs, 2 17 week old golden comets and 4 4 week old EEs. I have no idea what would be the best method.
Grab one bird at a time, dose it, put it in another area and repeat.
It would help to have a couple of syringes loaded and ready to go.
You could squirt it on a piece of bread and feed that to each bird... But you've got to keep the birds separated and only deal with one at a time.