Mareks Disease does come to mind here, however not eating usually comes later when the bird's system is going paralyzed. Many times you can look into their eyes and see signs of Mareks...the pupils will be out of round. Classic sign of Mareks.
There are a few other things that can cause a bird to go lame:
He could have sprained something internally and isn't something you can feel for...(heat or swelling) or even fractured a bone somewhere in his leg. Does he roost up high in the coop or tend to fly down from high tree branches or the roof? If so, it is possible something is sprained or fractured. Possibly a torn ligament. If he is in enough pain, this will keep him from eating.
Vitamin Deficiencies will definitely cause lameness. Especially if they are lacking in Vitamins B or E. A lack of A and D can also cause issues.
Botulism will cause lameness. Food borne, Airborne or from a puncture wound. This bacteria will cause nerve action to become blocked and the bird will go lame.
Internal tumors such as liver or kidney tumors can press on the nerves leading to the legs and cause lameness too.
Head injuries are classic to cause lameness and lack of appetite. Many times you can look into their eyes with this one and see the pupils very dilated, almost black.
Other bacteria such as Mycoplasma's can cause lameness as well, but usually the continue to eat until they are quite sick and lame.
And you already said he doesn't have bumblefoot so we can rule this out.
What EXACTLY does his poop look like? Comb color? And look into his eyes and see if you see out of round pupils or very dilated pupils??
There are a few other things that can cause a bird to go lame:
He could have sprained something internally and isn't something you can feel for...(heat or swelling) or even fractured a bone somewhere in his leg. Does he roost up high in the coop or tend to fly down from high tree branches or the roof? If so, it is possible something is sprained or fractured. Possibly a torn ligament. If he is in enough pain, this will keep him from eating.
Vitamin Deficiencies will definitely cause lameness. Especially if they are lacking in Vitamins B or E. A lack of A and D can also cause issues.
Botulism will cause lameness. Food borne, Airborne or from a puncture wound. This bacteria will cause nerve action to become blocked and the bird will go lame.
Internal tumors such as liver or kidney tumors can press on the nerves leading to the legs and cause lameness too.
Head injuries are classic to cause lameness and lack of appetite. Many times you can look into their eyes with this one and see the pupils very dilated, almost black.
Other bacteria such as Mycoplasma's can cause lameness as well, but usually the continue to eat until they are quite sick and lame.
And you already said he doesn't have bumblefoot so we can rule this out.
What EXACTLY does his poop look like? Comb color? And look into his eyes and see if you see out of round pupils or very dilated pupils??
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