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Crop Impaction, Crop Binding
An impacted crop is a serious condition in chickens in which there is a blockage preventing food from moving past the crop. This may be caused by the presence of a foreign body blocking the passage of food (such as string/plastic or long grass or plant material), or occur secondary as a result of problems with the muscular contractions (which is how food is able to move through the bird's digestive system). Problems with muscular contractions has known to occur in some forms of Marek's disease.
When treatment is delayed, the condition rapidly worsens and leads to infection and starvation.