I have two hens, one a Barred Rock, one a Rhode Island Red. The BR has suffered with roundworms for a while, and now the RIR has them as well. I have treated them with Worm Off and the pour on Eprinex (treatments I learned about on the boards here--thanks!), and I know they work somewhat, but the girls keep having worms. The BR is looking rather wan, and though she musters through and is still the bossy head hen, she does rest more than usual. Her breast bone seems prominent when I pick her up. She lays only every few days. Wasting away. I'm not sure what else to try. I don't think they could've developed a resistance quite yet, but I suppose that is possible. I am planning to build a solid chicken tractor next weekend so they can live on different soil for a while. (They have a fenced yard, and I let them out in a PVC tractor for a few supervised hours during the day. They used to free range more, but then came raccoons and hawks and owls.) I wrote to the vet school at the university, but got no response. I don't know any local vets that treat chickens. I put vitamins in their water. Any other suggestions? Thank you! I know you all understand my worried and helpless feeling.