What is the Crop
The chicken’s crop is located right beneath the neck against the breast and just right of the centre.
When a chicken eats the food goes into the crop, which extends to accommodate the food and, especially with young chicks, can be easily seen protruding after the bird has eaten
Causes of Sour Crop
Sour crop is caused when the crop doesn’t empty fully overnight and as a result the food ferments within the crop causing a fungal infection.
You can identify sour crop by checking the crop before the bird eats in the morning and if it is sour crop the crop will be watery or squishy like a balloon and if you open the bird’s beak a foul smell will emanate from it.