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Cystic Right Oviduct

Cystic right oviduct is a reproductive condition that affects laying hens. It is caused by the incomplete regression of the what would be, normally nonfunctional right oviduct. It can also be the result of an underlying illness such as infectious bronchitis virus.

Cystic right oviducts range in size from small 2 cm diameter, elongated cysts to a large fluid-filled sac up to 10 cm in diameter and greater. When cysts grow large, they compress the abdominal viscera and can result in the appearance of a disproportionally enlarged abdomen.

Certain breeds and strains (usually inbred) of egg laying hens are more susceptible to developing cystic right oviduct, such as the Rhode Island Red, White Plymouth Rock, Black Australorp, and Fayoumi.

Clinical Signs

Weight loss
Enlarged abdomen
Sudden death


  • History
  • Clinical signs
  • Physical exam
  • Ultrasound
  • Radiographs
  • Necropsy


Supportive care: Isolate the bird from the flock and place in a safe, comfortable, warm location (your own chicken "intensive care unit") with easy access to water and food. Limit stress. Call your veterinarian.


Scientific References

Age Range

The condition commonly occurs in older laying hens.

Risk Factors

  • High egg producing chicken breeds
  • Previous history of infectious bronchitis