Banti chicken with hurt leg
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Welcome to BYC. Is she holding the leg up or is she able to stand at all? Leg injuries are very common in chickens, and there could be a sprain or broken bone. Can she move her toes? Resting the leg in a crate or pen for 1-2 weeks may help her heal. Make sure that she has no swelling or a dark spot on her footpad which could be bumblefoot. Look for any swelling of the joints. Some poultry vitamins or BComplex in her water may also help. You might wait until night time when she is sleeping, and go into the coop with a flashlight or headlamp, where you can examine it. A picture may also help.
Do you know if she was vaccinated for Mareks disease? If not it could be that. Symptoms of Mareks may occur between 3 and 25 weeks of age on the average, but can occur later that that if they are exposed to a carrier bird several weeks before. Curled toe paralysis is another condition that can cause the toes to curl under, and is caused by a riboflavin (vitamin B2) deficiency. I would try some poultry vitamins just in case. Are her toes and legs still normal color?
If her chick crumbles are 16% layer feed or chick grower, then she is getting all she needs in a balanced diet. Scratch has only 8% protein, is not really needed, and only should be used as a treat. Sometimes feed can sit on the shelf or be in use a long time, and it can lose vitamins. She could have injured or broken the leg causing nerve damage, but I would be watching for Mareks symptoms. It can cause paralysis of one or both legs, wings, the neck, and cause tumors internally and externally.