18/08/2026
Every so often a keeper reaches into a nest box and comes out holding something that is clearly not an egg, and there is no good way to describe it the first time you see one. 🐔
It is usually pale yellow or grey, rubbery, roughly egg shaped, and it peels apart in loose layers like a hard boiled egg that went badly wrong. The common name for it is a lash egg, and it is not an egg at all. It is a cast of the hen's own oviduct: layers of infected tissue and cellular debris that built up inside her, took the shape of the tube they formed in, and eventually passed out the same way an egg would have.
What it points to is salpingitis, an infection and inflammation of the oviduct, usually bacterial and often traced to E. coli, though other organisms and a previous respiratory illness can be behind it too. The hard part is that the bird who passes one often looks completely normal in the run that morning. Chickens are prey animals and they hide illness right up until they cannot, so a lash egg is frequently the very first honest signal that anything is wrong inside her. 🌾
If you find one, it is worth a real vet call rather than a wait and see week. Some hens respond to antibiotics when it is caught early, some do not, and the outcome depends a great deal on how long it has been building. In the meantime, pull her out where you can watch her, keep her eating and drinking, and take note of whether she has been off lay, standing puffed, or walking with her tail down. Those are the details a vet will actually ask about.