I have an older hen who has the large bump on her throat. She's also very lethargic and moves her neck weird ways every so often. Here are some pictures to help with disease identification:
Please help!!
Please help!!
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ok, i believe i might know the problem, but im not sure... try checking out this page, it talks about the same effects your chicken is showing
http://www.raising-chickens.org/chicken-crop.html