For how many days to treat sour crop it’s been months that I have treated my hen. Also she gots a bit of food on her neck feathers that she cleans right now she was cleaning her neck feathers that had bit of wet food mush on it and some of it she eats



Here's what I would do. It sounds like her crop may not be emptying. Do keep in mind that often there's more going on and the bird is suffering from an underlying condition.
Since you did have some yeast(?) canker(?) issues in the past. Then I would treat for sour crop.
You can find Clotrimazole (Athlete's foot cream) at the dollar tree, dollar store or walmart.
Get some of that. Give your hen 1/2" of the cream twice a day for 7 days. In addition to the cream, give your hen 1 tsp coconut oil twice a day.
Don't massage the crop. Don't vomit the hen.
Make sure she's staying hydrated. You can syringe fluids and wet food into her or if possible, tube feed her. Links and photos to follow. .
Crop feeding.
https://www.backyardchickens.com/articles/crop-feeding.75454/
Syringing/giving oral medications
https://www.backyardchickens.com/ar...dications-to-all-poultry-and-waterfowl.73335/
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