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Cystic Oviductal Hyperplasia

Cystic oviductal hyperplasia or dilatation, is a reproductive tract condition affecting laying hens. The bodies of modern strains of commercial laying hens are highly susceptible to reproductive problems, as a result of the breeding them for excessively high egg production rates.

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.

Clinical Signs

Weight gain
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