I think this is a great thread, and I've referred to it many times.
For the first time, I saw adult roundworms in chicken poop in my coop. (Free-ranging flock, several years on same general area of dirt - it was inevitable.)
I have wormed in the past on general principles with ivermectin paste - calculated the oral dose, administered with a syringe, and applied some under the wings for good measure. Forgot where I read these instructions - not on BYC, I'm pretty sure. I know I got the ivermectin dose from a scientific paper where it was tested on chickens in the Middle East somewhere.
Based on what I've read here, I first wormed with piperazine (Wazine) using the manufacturer's instructions for chickens. I now have Ivomec Eprinex pour-on, which I was going to use today, and thus was double-checking on the recommendations for dosing.
I was surprised to read on some sites that Eprinex does NOT kill roundworms!! In fact I saw that in a couple of places. Maybe that was a mistake - meant to be "does NOT kill tapeworms" that was perpetuated by someone repeating it elsewhere.
I cannot find a place where anyone has actually tested the efficacy of Eprinex for roundworms in chickens. I'm going to use it anyway, but does anyone really know whether Eprinex does or doesn't kill roundworms in chickens?
Thanks for your help -