Egg Bound Chicken — How to Recognize and Treat It
When a hen cannot pass an egg and needs immediate help.
What's in this guide
What is it?
Egg binding (also called egg impaction) happens when an egg gets stuck in the reproductive tract — usually in the uterus (shell gland) or the lower oviduct. The hen strains visibly, may sit hunched in the nest, and stops laying. Common in young first-time layers, older hens with weak muscles, and hens producing extra-large or double-yolk eggs.
What are the symptoms?
- Hen sits in the nest box for hours without laying an egg
- Visible straining (tail pumping, hunched posture, pushing visibly)
- Walking like a penguin (waddling, holding tail down)
- Decreased appetite or refuses food entirely
- Pale, drooping comb
- Lethargy, fluffed feathers, hiding from the flock
- Visible firm bulge in the lower abdomen near the vent
- Vent area swollen, red, or wet
What causes it?
- Calcium deficiency — weak uterine muscles can't push the egg through. The #1 cause in backyard flocks.
- Oversized or double-yolk eggs in young pullets still developing proper egg-passing anatomy.
- Dehydration from inadequate water access — dry tissues make egg passage harder.
- Obesity or lack of exercise — fat around the reproductive organs slows egg movement.
- Cold stress — sudden cold snaps in winter cause muscle cramping in the oviduct.
- Reproductive tract infection or scar tissue from previous illness.
How to treat it — step by step
- Move her to a warm, dark, quiet space — a dog crate or single cage in a heated room (75-80°F). Stress and cold worsen muscle cramping.
- Warm-water soak: fill a sink or large basin with water at 100-105°F (warm bath temperature). Soak the hen from breast to vent for 15-20 minutes. The warmth relaxes muscles and lubricates the vent. Keep her head dry and supervise constantly.
- Dry her thoroughly with a towel (and a hairdryer on low if cold weather), then return her to the warm isolation space.
- Apply lubricant: a small amount of water-based personal lubricant or vegetable oil around the vent opening with a clean cotton swab. Do not push the swab inside.
- Liquid calcium: 1 mL of human-grade calcium gluconate (or 'Calcivet') by mouth via syringe. Calcium triggers stronger uterine contractions.
- Wait and repeat: most hens pass the egg within 1-4 hours of the first warm soak. Repeat the soak every 2-3 hours if needed.
- If still bound after 12 hours, call a vet — manual extraction or a Caesarean may be needed.
How to prevent it
- Always provide free-choice crushed oyster shell for laying hens — calcium prevents most egg-binding cases.
- Use a 16% protein layer feed (not chick starter, not all-flock) for hens over 18 weeks.
- Ensure clean, fresh water access at all times. Frozen water in winter is a major cause.
- Keep hens at healthy weight — overfed birds with low exercise are at higher risk.
- Insulate the coop during cold snaps. The Ember coop heater prevents the cold-stress cramping that triggers egg binding in zone 4-5 winters.
- Avoid forcing young pullets to lay before 22 weeks with supplemental lighting — early laying increases binding risk.
When to call a vet
- Hen has been straining for more than 4 hours
- Visible egg or tissue protruding from the vent (prolapse)
- Hen collapses or becomes unresponsive
- Blood from the vent
- First treatment cycle (warm soak + calcium) did not work within 8-12 hours
Frequently asked questions
Can an egg-bound hen die?
Yes — without treatment, most egg-bound hens die within 24-48 hours from shock, internal damage, or septicemia.
How long does treatment take to work?
Most hens pass the egg within 1-4 hours of the first warm soak. If she has not passed it after 12 hours of repeated soaks and calcium, see a vet.
Can I push the egg out manually?
Strongly discouraged unless guided by a vet. Pushing can rupture the egg inside her, causing fatal yolk peritonitis. Always try warm soak + lubricant + calcium first.
Will she lay normally again after recovery?
Most hens return to normal laying within 1-2 weeks. Some have recurring episodes if the underlying cause (calcium deficiency, oversized eggs) isn't fixed.
How do I know it's egg binding and not just a slow day?
Egg binding shows visible straining, penguin walk, and a firm bulge near the vent. A normal slow-laying hen sits calmly and shows no distress.
Is egg binding more common in certain breeds?
Yes — high-production breeds like Leghorns, Cinnamon Queens, and Black Stars are at higher risk because of the strain of frequent laying. Heavy-bodied breeds like Brahmas are at lower risk.
Related chicken care topics
🏠 Browse coops sized to prevent the underlying cause
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Browse all chicken coops →Sources cross-checked with University of California Davis Veterinary Medicine Extension, Mississippi State Extension Poultry, Penn State Extension, and the Merck Veterinary Manual. Not veterinary advice — consult a licensed avian or poultry vet for sick birds.