I have a 3-year-old chicken. I can't remember her breed, but she used to lay light blue to almost white eggs. Her eggs were very thin-shelled and were regularly eaten or kicked out of the way. She has not been laying for about 6 months. Yesterday evening when I checked on the chickens, she had been severely pecked by the other chickens and couldn't walk. Also, her neck was bent to the right and she will regularly bend her head upside-down in this direction. We separated her as soon as we found her and placed her indoors in a dog crate. She will eat and drink, can flap her wings, and, up until this evening, could scoot herself backwards through the use of her left leg and right wing. Most of the time she lays with her feet stretched in front of her and her head on the ground to the right and her right wing outstretched. I have read about Merek's and it seems like a likely answer except that everyone refers to it as a disease of young chickens. The other chickens in our flock seem unaffected, though we are doing a thorough cleaning of the coop. There were no symptoms prior to yesterday evening and her condition seems to have become worse since we first recognized it. Does this sound like Mereks? Is there any chance that it's a vitamin deficiency? I hate to put her down, but I would also hate to leave her in this condition if she won't recover as it looks exceedingly uncomfortable.
Thanks
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