What is sour crop?

Sour crop is a fungal overgrowth in the crop caused by a disruption to the normal flora. Affected chickens are often dull and can have fluid filled, enlarged crops. A number of factors can contribute to sour crop, but ensuring your chickens have an appropriate diet can reduce the risk. Keep treats to a minimum and do not feed your chickens human foods high in refined sugar or starch. Sour crop should be differentiated from an impacted crop. If you suspect your chicken has sour crop please seek advice as this should be managed by your vet.