Sour and Impacted Crop in Backyard Chickens - Symptoms, Causes and Natural Treatment

As many of you know, my friend Yvette lost her beloved hen Lily to sour crop this past January. Even with the help of her vet, she was not able to save Lily. 

This prompted her to research sour crop in an effort to try and prevent it from happening again - or to be able to successfully treat it the next time if it does happen.  We hope that you will find this post informative.  

If it saves even one chicken, Lily's death will not have been in vain.  It is so hard to lose a pet, and a chicken is no different.  

Sour Crop ~ What it is & how to identify it.

The chickens' crop is located beneath the neck and just to the right of the center of the breast area.  When chickens eat, the food goes directly into the crop, which will become engorged until the food continues through the digestive system.  

The entire digestive system is roughly twelve inches long with the mouth at 1 inch, the crop at 3 inches, the stomach at 5 inches, the intestine between 6-11 inches and the rectum at 12 inches. If there is an infection or blockage anywhere along the digestive tract, the chicken can end up with a stopped-up crop.

The process of fully emptying the crop can take several hours, and generally happens overnight, depending on the amount of food ingested.  Each morning, the crop should be empty, and the extended crop should not be present.


Sour crop is caused when the crop does not fully empty.  This may cause the contents to become fermented, resulting in a bacterial / yeast infection within the crop.  

Long grasses, excessive amounts of bread and pasta, moldy feed and inadequate amounts of grit can all contribute to sour crop, as can the chicken inadvertently swallowing pieces of plastic, rubber bands or other indigestible substances.


Like most things, prevention is easier than a cure. Prevention of sour crop includes limiting access to long or tough plant fibers, adequate fresh water with apple cider vinegar added several times a week (in a ratio of 1 Tablespoon/gallon of water) to keep the body alkaline versus acidic, and plain yogurt or probiotics on a weekly basis, as well as providing plenty of grit to aid in digestion.

Sour crop can also be a side effect of any illness that causes dehydration. Unfortunately crops swollen with food will draw even more water from the bloodstream, leading to further dehydration and more food backup. Therefore liquids are extremely important in treating sour crop and clean, fresh water is a necessity in the run at all times. 

Adding a smashed fresh garlic clove to the water can be beneficial as well to fight bacteria and strengthen the immune system.


Sour crop is best identified in the morning.  If the crop is extended and feels squishy, not hard, then the crop has not emptied as it normally should.   

You also will notice a ‘sour’ smell coming from the beak of the chicken and in some cases a foul-smelling liquid may also leak out of the chickens mouth.   

Your chicken may show signs of being lethargic. She may isolate herself – not eating or ‘scratching around’ as normal chicken behavior.  She may vomit and her skin may appear red instead of pink.

(Note: a hard crop can signal impacted crop which is a slightly different issue, also caused by large items in the crop that can't pass through the digestive system.  

Impacted crop can be treated by lubricating the crop/digestive tract with vegetable oil in an eyedropper through the mouth and massaging the crop to try and break up the blockage, or in extreme cases actually slitting the crop open with a scalpel and removing the blockage. An impacted crop can actually press against the windpipe of the chicken and suffocate the hen.) 


If you suspect sour crop, isolating your chicken in a warm,quiet area, holding her upside down, gently massaging the crop in the direction of the head and carefully trying to induce vomiting, encouraging yogurt, olive oil and water with apple cider vinegar is a great way to start. 

Apple cider vinegar is an anti-fungal, and often avian vets will recommend it for cases of sour crop, since sour crop is basically a yeast infection.

Oregano oil is a natural antibiotic that can be helpful as well. It has been studied in commercial poultry houses in conjunction with cinnamon to work in place of antibiotics. Sprinkling a bit of cinnamon over some plain yogurt and adding a drop of oregano oil might be an option you would want to consider. (This is a good option for the oregano oil since it's already diluted in olive oil.) 

-Oil of Oregano oil diluted in olive oil can help prevent sour crop and get things moving again-
If after several days of home remedies the crop still seems abnormal, it is probably time for a visit to your vet.  There are several options that can be considered for treatment, including fluid injections and/or antibiotics, however it’s best to seek direct advice from an Avian Veterinarian.

The pharmacy at the
 Virginia Beach Veterinary Hospital
Many thanks to Yvette for doing all the research and writing up this information to share with you.  

The Poultry Pages/  
Chicken Vet UK

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