I used strongdid, but I calculated the math out and only gave .1ml of the paste to each hen using a needle less syringe.
How much do your hens weigh?I have yet to see an actually worm, just a few larvae that looked to have just hatched in her poop that was attached to her rear feathers. They were yellowish and oval like.
Show me your math on the dosing.
You are/were seeing worm larvae in your hen's poop and attached to her rear feathers?
You should not be seeing larvae on the hen's feathers, it sounds like Maggots instead of Roundworms.
Gather her up, give her bottom a very good soaking in warm soapy water, clean up all the poop off of her and make sure there are not any more worms/larvae on her or her skin. Look for any type of wound around the vent, to the sides or below the vent.
If you find maggots/larvae and/or a wound, please get some photos. You'll want to get all the larvae off of her.