Health note: This guide is general information, not veterinary advice, and our writers are not veterinarians. If a bird is sick, injured or not improving, contact a poultry vet, and always follow product labels and your vet's instructions for any medication. How we write health content.
A lash egg is not a true egg but a rubbery mass of cheese-like pus and debris passed by a hen whose oviduct is inflamed, a condition called salpingitis that is most often caused by a bacterial infection, mainly E. coli. Finding one means the hen who laid it has a reproductive tract infection and needs a veterinarian. This guide explains what lash eggs are, what causes them, what to do, and what outlook to expect.
Key Takeaways
- A lash egg is a sign of salpingitis, an inflammation of the oviduct.
- Salpingitis is the most common bacterial infection in laying hens and is mainly caused by E. coli.
- Infected hens can shed bacteria to the rest of the flock.
- Do not try to remove or treat a lash egg at home; contact a veterinarian.
- Antibiotics require a vet’s prescription in the US, and hens with chronic salpingitis often stop laying.
Correction: an earlier version of this article described lash eggs as calcium deposits caused by hormonal imbalance, said they are not infectious, gave an invented origin for the name, and recommended home removal techniques and procedures such as vent massage and cloacal flushing; these errors have been removed.
What is a lash egg?
A lash egg is an irregular, rubbery mass that can look like an egg but is not one. It is made of caseous (cheese-like) pus, fibrin and sometimes yolk or shell material that builds up in an inflamed oviduct.
The oviduct is the tube an egg travels through before it is laid. For a refresher on how it works, see our guide to the chicken reproductive system. Lash eggs are not calcium deposits or a harmless egg-shape oddity.
What causes lash eggs?
Lash eggs are caused by salpingitis, an inflammation of the oviduct. The inflamed oviduct may contain liquid or caseous exudate, and the solid form is what a hen passes as a lash egg.
Salpingitis is considered the most common bacterial infection in egg-laying hens, and it is mainly caused by Escherichia coli. Other bacteria can also be involved, including:
- Mycoplasma gallisepticum, the cause of chronic respiratory disease
- Salmonella species
- Pasteurella multocida, the cause of fowl cholera
There is no good evidence that hormonal imbalance, diet or stress cause lash eggs. The documented cause is infection of the oviduct.
Are lash eggs contagious?
The lash egg itself is a result of infection, and the infection can spread. Hens with chronic salpingitis may keep laying for an unknown period while shedding pathogenic E. coli, which allows spread to flockmates and through eggs. So a lash egg is a flock concern, not just a problem for one hen.
Because the same bacteria that cause salpingitis, such as Mycoplasma gallisepticum and Pasteurella multocida, cause serious flock diseases, a veterinary diagnosis helps you know what you are dealing with.
Signs to watch for
Many hens with salpingitis show few outward signs until a lash egg appears. Things to notice include:
- A lash egg in the nest box or run
- Fewer eggs, or a hen that stops laying (hens with chronic salpingitis are often out of lay)
- Soft-shelled or misshapen eggs
A drop in egg production and soft-shelled or misshapen eggs are also on USDA’s list of signs that can point to avian influenza or virulent Newcastle disease. If several birds are sick or dying suddenly, call your state veterinarian or USDA at 1-866-536-7593. Our guide to why chickens stop laying covers other causes of a laying slowdown.
What to do if you find a lash egg
- Do not try to remove or treat anything yourself. A lash egg you find has already been passed. Lubricating the vent, massaging the abdomen or bathing the hen are not recognized treatments, and pressing on an inflamed oviduct can cause harm.
- Work out which hen laid it, if you can, by watching the nest boxes.
- Keep the lash egg in case your vet wants to see it, and wash your hands after handling it.
- Contact a veterinarian to examine the hen and discuss testing and treatment.
Veterinary treatment and outlook
A veterinarian may prescribe antibiotics. Since June 11, 2023, medically important antibiotics for animals in the US require a veterinarian’s prescription. Any drug not labeled for chickens is extra-label and must be used under a vet’s direction, with an egg withdrawal time the vet sets. Enrofloxacin and other fluoroquinolones must never be used in chickens.
In some cases, a veterinarian may discuss surgery to remove the oviduct (salpinx) while leaving the ovary in place. This is a veterinary procedure only; there is no safe home surgery for reproductive problems.
Be prepared for a guarded outlook. Hens with chronic salpingitis are often out of lay, with a shrunken ovary. If a hen is suffering and not responding to treatment, humane euthanasia by a veterinarian is a reasonable option. Salpingitis can occur alongside peritonitis; see our guide to egg yolk peritonitis.
FAQs
Is a lash egg safe to eat?
No. A lash egg is not a real egg; it is a mass of pus and debris from an infected oviduct and should be discarded or kept for your vet.
Can a hen lay normal eggs after a lash egg?
Some hens with chronic infection keep laying for a while, but many hens with chronic salpingitis stop laying. If your hen is given medication, follow your vet’s egg withdrawal time.
Why is it called a lash egg?
There is no well-documented origin for the name. What matters is what it signals: salpingitis, an infection of the oviduct.
Can lash eggs be prevented?
There is no guaranteed prevention. Because Mycoplasma gallisepticum can contribute to salpingitis, buying birds from NPIP MG-clean sources and practicing good biosecurity reduces one known risk, and prompt vet care for sick hens limits spread.
Conclusion
A lash egg is a warning sign of salpingitis, an oviduct infection that is usually bacterial and can spread in the flock. Skip home remedies, identify the hen, and get her examined by a veterinarian, who can advise on prescription treatment or humane options.
Sources
- Merck Veterinary Manual: Salpingitis in Poultry
- PMC (Veterinary Research, 2020): Whole genome sequence comparison of avian pathogenic E. coli from acute and chronic salpingitis of egg laying hens
- Merck Veterinary Manual: Common Management-Related Problems in Backyard Poultry
- FDA: GFI #263 Frequently Asked Questions for Farmers and Ranchers
- FDA: The Ins and Outs of Extra-Label Drug Use in Animals
- FDA: Withdrawal of Enrofloxacin for Poultry
- Merck Veterinary Manual: Mycoplasma gallisepticum Infection in Poultry
- USDA APHIS: How to Report Sick Birds (Defend the Flock)
Checked September 2026. Labels change, so always read the label on the product you buy. See our editorial policy for how we research health articles.
