Chicken suddenly sick and died, don't know why??
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I'm sorry to hear of your loss.
There are so many things chickens can die of and unless you do a necropsy, you'll probably never know for certain.
Brooding weakens the immune system of hens, and she was moved to a new location during that, you say 4 months ago? That could have created numerous stresses that brought on latent illnesses or conditions.
I suspicion coccidiosis may have been involved. There are numerous types, and not all produce the typical bloody diarrhea.
Mareks is very common, and a slow growing type can be triggered by a move as that is a stressor.
Older hens can get liver failure from numerous conditions, especially commercial breeds for high lay....early laying can bring on general early demise. Also too high of protein feed, or not enough nutrients in the feed. They also become dehydrated and anemic with worm overload. She might have eaten something on the property that made her unwell.
I hope you had her isolated appropriately. Chances are, she will be the only one that dies. Every so often I have a chicken that dies for no obvious reason...just becomes lethargic, starts wasting, then dies.
Again without a necropsy, you'll never know for certain.
Just watch the rest of the flock. I'd put them all on ACV in the water and extra vitamin boosts to help with their immune systems. If you haven't wormed or pest treated in awhile, I'd do so now if everyone looks normal. (You might not want to worm during a bout of something.)
You might put everyone on medicated (Amprolium) chick feed if coccidiosis is a possibility. The new bird may have been affected by the different cocci in your soil, but she also would have brought a different type from her soil. Coccidiosis can happen quickly, or can be a slower, wasting condition depending upon the type of coccidia and where they located in her system.
My 2 cents.
Edited by Lady of McCamley - 10/22/15 at 12:32am