Egg Yolk Peritonitis / Reproductive Coelomitis
Learn what the condition is, how it may be detected early, how it is treated or managed, and which breeds or species are linked to it.
Condition snapshot
A concise guide to the condition’s pattern, detection, management and urgency.
Emergency presentation is possibleBreathing difficulty, collapse or rapidly increasing abdominal distension requires emergency stabilisation.
This snapshot is a general guide, not a diagnosis or treatment plan. New, severe or worsening signs require veterinary assessment.
About the condition
Egg-yolk coelomitis is severe inflammation within the body cavity after yolk or other reproductive material escapes the normal oviduct pathway. Birds do not have a diaphragm separating abdomen and chest, so coelomic fluid and inflammation can rapidly restrict air sacs and breathing. Secondary bacterial infection, often termed egg-yolk peritonitis, may accompany the sterile chemical reaction.
Causes include ectopic ovulation, ruptured or inflamed oviduct, impacted material, neoplasia and chronic laying. Cockatiels are frequently affected. Signs include depression, anorexia, abdominal enlargement, ascites, wide stance, reduced droppings, tail bobbing and respiratory distress. Yolk emboli or associated pancreatitis can cause sudden neurological deterioration.
The presentation overlaps egg binding, cystic ovary, tumour, liver disease and heart failure. Free fluid does not establish that yolk is present, and aspirated yellow material can be inflammatory exudate. Because a compromised bird may collapse under restraint, stabilisation can precede definitive sampling.
This is not resolved by waiting for an egg to pass. Some birds respond to drainage, antimicrobials and reproductive suppression, while organised material or diseased oviduct requires surgery. Prognosis is fair for medically responsive disease and guarded with septic shock, repeated internal ovulation or high-risk surgery. Salpingohysterectomy removes the oviduct but not all ovarian tissue, so future ectopic yolk release remains possible. Long-term control must suppress reproductive drive as well as clear the current inflammation. Yolk or infected reproductive material within the coelom provokes intense inflammation and can lead to adhesions, sepsis and respiratory compression. Hens may show abdominal enlargement, wide stance, reduced laying, anorexia and laboured breathing. Internal ovulation, oviduct rupture, salpingitis and chronic egg production are related but distinct mechanisms. Free yolk also provides a rich medium for bacteria. Disease may be acute after a single event or chronic when repeated ovulation continues to release material into the abdomen.
Screening & Early Detection
Record laying history, prior dystocia, hormone therapy and speed of abdominal enlargement. Observe breathing before handling and assess weight, perfusion, vent and coelomic contour. Complete blood count may show marked inflammatory leukocytosis; chemistry evaluates calcium, proteins and organ function.
Radiographs and ultrasound identify fluid, reproductive structures and retained eggs. Carefully performed coelomocentesis can relieve pressure and provide fluid for cytology, culture and chemistry, but sudden volume shifts and organ puncture are risks. Endoscopy or surgery provides definitive visualisation when the bird is stable enough.
Differentiate yolk inflammation from hepatic or cardiac ascites, tumour and gastrointestinal disease. Monitor respiratory rate, abdominal circumference, gram weight and fluid recurrence. Dyspnoea, collapse or rapid distension needs emergency oxygen and drainage planning. After improvement, imaging confirms whether oviduct material remains. Ultrasound can identify fluid, follicles and oviduct changes; radiographs show organ displacement but cannot label fluid as yolk. Coelomic fluid analysis and culture help distinguish sterile yolk inflammation from bacterial infection. Blood count, chemistry and ionised calcium assess systemic impact and treatment safety.
Treatment & Management
Stabilise with oxygen, warmth, fluids, analgesia and nutrition. Therapeutic coelomocentesis may reduce air-sac compression, with controlled removal and monitoring. Broad antimicrobial treatment is started when septic coelomitis is likely and refined by culture; anti-inflammatory medication addresses the intense chemical reaction while accounting for kidney and gastrointestinal risk.
GnRH agonist therapy suppresses further ovulation. Persistent inspissated yolk, ruptured oviduct, salpingitis or recurrent fluid may require endoscopic lavage or salpingohysterectomy after stabilisation. Surgery is technically demanding and prognosis depends on adhesions and systemic disease.
Recheck inflammatory values, fluid, appetite and respiratory function. Correct calcium and nutrition and remove reproductive triggers through photoperiod, nesting and pair-bond management. Antibiotics alone will fail if yolk continues entering the coelom. Birds with repeated severe episodes despite suppression need realistic welfare assessment. Following oviduct surgery, ongoing ovarian activity is still monitored because ectopic ovulation remains possible. Oxygen, warmth, fluids, analgesia and carefully supported nutrition come first. Antibiotics are indicated when infection is suspected or demonstrated, not simply because yolk is present. Fluid drainage may relieve pressure but does not correct the source; hormonal suppression or salpingohysterectomy may be required in recurrent or structurally diseased hens.
Breeds or species affected
Adelaide Rosella
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Bar-shouldered Dove
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Blue-faced Parrot Finch
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Bourke's Parrot
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Brown Quail
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Budgerigar
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Cockatiel
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Common Bronzewing
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Crested Pigeon
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Diamond Dove
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Eastern Rosella
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Elegant Parrot
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Emerald Dove
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Galah
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Gouldian Finch
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Hooded Parrot
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King Quail
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Little Button-quail
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Little Corella
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Long-billed Corella
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Musk Lorikeet
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Painted Button-quail
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Painted Finch
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Pale-headed Rosella
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Peaceful Dove
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Port Lincoln Parrot
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Princess Parrot
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Rainbow Lorikeet
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Red-capped Parrot
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Red-collared Lorikeet
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Red-rumped Parrot
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Scaly-breasted Lorikeet
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Scarlet-chested Parrot
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Star Finch
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Stubble Quail
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Sulphur-crested Cockatoo
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Twenty-eight Parrot
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Western Corella
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Western Rosella
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Yellow Rosella
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Zebra Finch
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Canary
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Society Finch
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Domestic Pigeon
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Indian Ringneck Parakeet
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Alexandrine Parakeet
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Peach-faced Lovebird
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Fischer's Lovebird
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Sun Conure
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Jenday Conure
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