I (and two vets) suspect that my Light Brahma, Goose, has Marek's. About three months ago, she started limping, and now she is unable to stand. She still moves one leg, but I think she may have hurt it while compensating for the unusable leg, so we made her this sling. We included a removable roosting bar for her to grab on to since she always loved to perch on her roosts, and my husband 3D printed her some cup holders for her food. Goose is about a year old.
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If we can ever help any of you by making and sending you one of these to help your chicken, we'd love to. We are also working on designing a similar structure that is smaller and for chicks that can quickly be 3D printed and shipped out to help those of you dealing with baby chicks with splay legs and such. We would do it for free or cost. Not looking to make money. Just looking to help all of the chickies. Feel free to send me a message if any of that sounds like it could help out your chooks.