Chicken Prolapse Vent – What is it

Chicken Anatomy  for Chicken Prolapse Vent Article -

Special thanks to the Animal Sciences Department at the University of Kentucky

Chicken prolapsed oviduct is a natural condition that occurs when a chicken lays an egg. The oviduct naturally turns inside out to let the egg out, then returns to its normal position. If a chicken prolapse vent doesn’t go back inside, it can be alarming. Also known as a prolapsed oviduct, blow-out, cloacal prolapse, pickout, eversion, or everted, this condition requires immediate attention. In this article, we’ll look into what chicken prolapse is, its causes, how to identify it, treatment options, and prevention strategies.

What is Chicken Prolapse?

Chicken prolapse occurs when the lower part of a hen’s oviduct turns inside out and protrudes through the vent. The anatomy involved includes the oviduct, vent, and cloaca. There are different types of prolapse, such as vent and oviduct prolapse, but the treatment and prevention strategies are often similar.

Anatomy 101

The oviduct is the tube through which an egg travels from the ovary to the outside world. The vent is the external opening that serves as the exit for both eggs and waste. The cloaca is the internal chamber that the vent opens into, where the digestive, urinary, and reproductive tracts meet.

Types of Prolapse

Different types of prolapse can occur in chickens, each with its own set of challenges:

Vent Prolapse: This is the most common type and involves the oviduct protruding through the vent.

Oviduct Prolapse: This is more severe and involves a larger oviduct section.

Cloacal Prolapse: This involves the cloaca and is often more complicated to treat

Severity and RisksThe severity of the prolapse can vary. In mild cases, only a small portion of the oviduct may be visible, but in severe cases, a large section may protrude, increasing the risk of infection or pecking by other chickens

If left untreated, the condition can lead to more severe health issues, including death. 

By understanding what chicken prolapse is, the anatomy involved, and the different types and terminologies, you’ll be better equipped to identify and treat this condition effectively.

Causes of Chicken Prolapse

Understanding the root causes of chicken prolapse is crucial for both treatment and prevention. Here are some of the most common factors that can contribute to this condition:

Age and Physical Condition

 Chickens that begin laying too young often lack the physical maturity to handle egg-laying, making them more susceptible to prolapse. Such “forced” laying can weaken the young chicken’s vagina.

Older and Obese hens can also be at risk due to weakened muscles and tissues.

Egg Size and Frequency

  • Large Eggs: Eggs that are too large can cause excessive strain on the oviduct during laying.
  • Double yolkers: These are often larger than normal eggs and can cause similar issues.
  • Frequent Laying: Hens that lay more frequently than usual may also be at risk.

Nutritional Factors

  • Calcium Deficiency: Adequate calcium is essential for muscle function. A deficiency can lead to weakened oviduct muscles.
  • Imbalanced Diet: Other nutritional imbalances can also contribute to prolapse.

Behavioral and Environmental Factors

  • Holding Droppings: Chickens that hold in droppings for extended periods can experience stress and stretching of the cloaca, leading to prolapse.
  • Stress: Factors like changes in the environment, predators, or bullying from other chickens can contribute to stress, which may lead to prolapse.

Identifying Chicken Prolapse

Early identification of chicken prolapse is vital for effective treatment. Here’s what to look for and how to differentiate it from other conditions:


  • Swollen Vent Area: The area around the vent may appear swollen or red.
  • Visible Internal Tissue: In severe cases, internal tissue may visibly protrude from the vent.
  • Difficulty Laying Eggs: The hen may show distress or difficulty while trying to lay eggs.

Diagnostic Methods

  • Visual Inspection: Regularly check your hens, especially those in high-risk categories, for signs of prolapse.
  • Behavioral Signs: Watch for changes in behavior, such as reduced activity, that could indicate discomfort or pain.

Differential Diagnosis

  • Egg-Binding: This condition also affects the vent area but involves an egg getting stuck in the oviduct. It requires different treatment.
  • Vent Gleet: This is a fungal infection that can cause swelling around the vent but doesn’t involve protruding tissue.

By knowing what to look for and how to differentiate chicken prolapse from other conditions, you can take timely action to treat the affected hen and prevent the condition from worsening.

Treatment Options

When you identify a chicken with prolapse, immediate action is crucial. Here’s a step-by-step guide on what to do:

Immediate Steps

  • Separate from Flock: Isolate the affected chicken to prevent further injury from pecking by other birds.
  • Clean Protruding Tissue: Gently clean the area with a mild antiseptic solution to prevent infection.

Medical Treatments

  • Manual Replacement: Carefully push the protruding tissue back into place using a gloved hand.
  • Anti-Inflammatory Cream: Apply a veterinary-approved anti-inflammatory cream to reduce swelling.
  • Vitamins and Supplements: Provide a balanced diet supplemented with vitamins, electrolytes, or liquid calcium to aid recovery.

Veterinary Intervention

  • Consult a Vet: If the condition persists or worsens, consult a veterinarian for a more thorough examination and possible surgical intervention.
  • Antibiotics: In some cases, antibiotics may be prescribed to prevent infection.

Prevention Strategies

Prevention is the best medicine. Here are some strategies to minimize the risk of prolapse in your flock:


  • Balanced Diet: Ensure your chickens have a balanced diet rich in essential nutrients, especially calcium.
  • Supplements: Consider adding vitamin and mineral supplements to their diet as a preventive measure.

Environmental Factors

  • Adequate Space: Overcrowding can lead to stress, which contributes to prolapse. Make sure your chickens have enough space to move freely.
  • Proper Nesting: Provide comfortable nesting boxes that encourage natural laying behavior.

Stress Management

  • Environmental Enrichment: Toys, perches, and dust baths can help keep your chickens entertained and stress-free.
  • Predator Protection: Secure your coop to protect against predators, as stress from predator attacks can contribute to prolapse.

Chicken Prolapse Vent – What it is…

Chicken prolapse is a serious condition that requires immediate attention. Early detection and appropriate treatment are crucial for the well-being of your flock. Always consult a vet for persistent or severe cases.

Thanks for stopping by. Please comment if you have any experience with this topic or want to say hello.


Leave a Comment

Optimized with PageSpeed Ninja