Here's my article on dealing with crop issues.
https://www.backyardchickens.com/ar...w-to-know-which-one-youre-dealing-with.73607/ It tells you what you need to know to be able to help your chicken with a crop issue.
Your chicken may just be inhaling some dust during eating. Mine do this when they dive into dry feed since they think it's a real treat, usually getting wet fermented feed.
Best thing to do to educate yourself on chicken crops is to go feel your normal chickens' crops. The pouch on the chest wall which hangs slightly off to the right collects the food the chicken eats. It's kind of like our mouth where preliminary digestive juices come into play, only minus teeth. If the chicken consumes too much cellulose, grasses are worst, impaction can occur, and it becomes like a slow sink drain or sometimes a major clog. It can back up into the throat and cause respiratory sounds as it gets into the airway.
A crop fills with food and it empties as the food moves on through the digestive system.
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The best time to check a sick chicken's crop is first thing in the morning because the crop should be flat and empty. If it's not, then you know you have a crop issue. The article goes over how to tell which one and what to do to treat it.