I have a couple chickens passing large roundworms in their poop. Half of my flock is molting, so while I do not want to wait to treat the birds, I also don't want to use either fenbendazole or valbazen and risk harming feather growth (yes, I realize valbazen may or may not affect feathers). I prefer to treat each chicken orally, whether it is a paste or liquid to make sure each bird gets the correct amount. I do NOT want to use ivermectin in any form. I have used it in the past and not only did it not kill the worms, it killed my favorite bird. I'm contemplating Nemex (pyrantel pamoate), but is there another oral option I don't know about