Egg Binding- Causes, Symptoms and Prevention
- Donna Weekes
- Feb 2
- 4 min read
Updated: Mar 7

Egg binding can be a serious issue for hens in your backyard flock. If a hen is unable to pass an egg, it can lead to distress and even life-threatening situations. If the egg is not passed within 24-48 hours, the hen is likely to perish. Recognizing the signs of egg binding and understanding how to treat it is vital for keeping your chickens healthy.
What is Egg Binding?
Egg binding occurs when a hen cannot pass an egg due to various factors, such as anatomical issues, nutritional deficiencies, or stressful environments. If a hen becomes egg-bound, she may show noticeable signs of discomfort or illness. The problem can escalate quickly, making early identification and intervention crucial.
A hen's uterus (aka shell gland) is the muscle responsible for squeezing the egg out of the vent. Since muscles require calcium to contract properly, if a hen has a calcium deficiency, the egg can get stuck in the uterus.
For instance, research indicates that egg binding affects approximately 3 to 5 percent of backyard flocks, highlighting the importance of vigilance among chicken keepers.
Signs of Egg Binding
Recognizing the signs of egg binding promptly can save your hen's life. Here are the most common indicators:
Lethargy and Decreased Activity: The affected hen may seem more fatigued than usual, staying away from the flock.
Passing Wet Droppings: or none at all (egg interferes with normal defecation)
Posture Change: Hens that are egg-bound often hold their tail down and adopt a hunched position. Walking like a penguin or frequent, uncharacteristic sitting.
Abdominal Swelling: Swelling or bloating in her abdomen or abdominal straining.
Reduced Egg Production: A sudden decline in egg production.
Droopy/ Depressed: Pale comb and wattles.
Exam: Presence of an egg in the oviduct upon exam.
If you observe any of these symptoms, taking immediate action is imperative.
Causes of Egg Binding
Understanding what causes egg binding can help you prevent it. Here are some key factors:
Nutritional Deficiencies: Low levels of vitamins and minerals, particularly calcium, weaken the muscles needed for laying eggs. For example, studies suggest that hens on a deficient diet are 50% more likely to experience egg binding.
Obesity: Hens that are overweight may encounter more complications with egg-laying. Research shows that obesity can raise the chances of egg binding by 20%.
Age: Aging hens face anatomical changes that can raise their risk of egg binding.
Infection: A reproductive tract infection can disrupt normal egg-laying processes.
Excessively large or misshapen egg.
Premature layer: Hen began laying eggs before her body was fully mature.
Egg Retention: Due to lack of sufficient nesting areas.
Understanding these causes allows backyard chicken owners to take proactive measures, which can significantly reduce the incidence of egg binding.
How to Treat Egg Binding
If a hen becomes egg-bound, swift action is necessary. Here’s how to proceed:
1. Assess the Situation
Begin by gently examining your hen. Gently feel on either side of her vent with one hand (think squeezing the cheeks of a cute kid). Offer Chick' N Swell Brand- Vitamin+s and Electrolytes in the drinking water. Even if she's not interested in drinking, carefully try to get some water into her with a dropper or syringe. If she is too weak to drink, don't force it.
2. Keep Her Comfortable
Place the hen in a quiet, warm area, separate from the flock. Ensure she has access to water with the vitamins and electrolytes added, and minimal stress.
3. Apply KY Jelly
Applying KY jelly to the vent can also help lubricate the cloaca to allow for ease of passage when the egg gets to that point (do not use olive oil, which can become rancid.)
**DO NOT massage the vent, abdomen or oviduct!**A broken eggshell can mean curtains for the hen.
4. Add Moisture
A warm bath at home can't hurt, but probably won't help.
If a truly egg-bound hen does not pass the egg within an hour of these measures, the egg may need to be manually removed, which is risky.
5. Seek Veterinary Assistance
If the egg is not passed after a few hours, contacting a veterinarian is essential. A vet would hydrate the hen and administer calcium intravenously. They can provide further examination or, in severe cases, perform a surgical intervention.
Preventing Egg Binding
Avoiding egg binding is always better than treating it. Here are some effective preventive measures:
1. Balanced Nutrition
Ensure your hens receive a diet rich in calcium, formulated to provide complete nutrition, like quality layer feed, which should have around 16% calcium content. This can help prevent deficiencies that may lead to egg binding.
2. Stress Reduction
Create a comfortable living environment for your hens. This includes adequate space, shelter from harsh weather, and measures to reduce noise and prevent aggressive behavior within the flock.
3. Maintain Healthy Weights
Regularly check your hens' weight and modify their feed and exercise plans to prevent obesity. Keeping hens at a healthy weight can substantially lower the risk of egg binding.
Avoid excess treats that can cause obesity and interfere with balanced nutrition in layer ration particularly in hot weather when hen eats less feed.
Final Thoughts on Egg Binding
Egg binding is a serious condition for backyard hens, but with proactive management, it can be effectively managed. By being aware of the signs, causes, and treatment methods outlined in this blog, you can maintain a healthy and productive flock.
Caring for chickens goes beyond basic feeding and housing; it involves a commitment to watching for health issues. By staying informed and attentive, you can ensure your flock thrives while providing fresh, nutritious eggs.
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