You lift the nest curtain and there it is, tucked in the straw where you expected a proper egg. Something that gives under your fingertip. Membrane, no shell, or barely any — a little water balloon of a thing, warm from the hen who laid it. She's already off the box, scratching about like nothing much happened. And it didn't, not really. But you stand there a moment, holding it, wondering what it means.
Most keepers find one of these eventually. The first time is a small shock — eggs are meant to be firm, and this one isn't. The instinct is to worry, to assume something's gone wrong inside her, to start reading everything at once. Let's not do that yet. One hen at a time, love. A single soft-shelled egg is a note, not an emergency. It's the flock's way of telling you something is a little off — usually something small, sometimes something worth watching, occasionally something for a vet to look at. The trick is knowing which.
So let's have a proper look at her, and at what her body was trying to do. A shell is calcium, laid down in the last stretch before she lays. If the calcium isn't there in the amount she needs — or her body couldn't get to it in time — you get membrane without the hard case around it. That's the whole mechanism, more or less. Everything else is just the reason the calcium fell short on that particular morning.
The common reasons are gentler than they sound. Calcium is the first one. If oyster shell has run low in her dish, or she's been ignoring it, her body dips into what it has and sometimes runs thin. A separate bowl of crushed oyster shell, always available, sorts most of this out on its own — she'll take what she needs. Age is another. A young hen just coming into lay hasn't got the rhythm yet; her first few eggs can be soft, odd-shaped, tiny. Same at the other end — an older girl winding down her laying years will sometimes miss the shell. Neither is trouble. It's the body finding its way, or setting its work down.
Then there's stress. A fox at the fence in the night, a new hen shaking the pecking order, a dog she didn't expect, a move to a new run. Stress interrupts the laying process — the egg gets rushed through before the shell has finished forming. You'll often see one soft egg the morning after something happened, and then nothing more. Her body catches up. And heat does something similar. On the hottest days she pants to cool herself, and panting shifts the balance her shell-making depends on. A hot spell can bring a soft egg or two through the flock, and cooler days settle it.
Her comb tells you plenty, and so does the next morning's egg.
So when you find one, this is what I'd do. Note the day. Have a look at her — how she's carrying herself, her comb colour, whether she's eating and drinking as usual. Check the oyster shell dish is topped up and somewhere she can get to it easily. Keep her water close and shallow, especially in warm weather. And then wait. One soft egg from a hen who's otherwise bright and busy is almost always a one-off. No rush — she's holding steady.
What changes the picture is repetition. If you're finding soft or shell-less eggs from the same hen day after day, or several times in a week, that's a different conversation. Persistent soft eggs can mean her calcium metabolism isn't keeping up, or there's something going on with the shell gland itself, or an infection that needs proper treatment. See a vet on this one — then come back and tell me. Take a photo of the egg if you can, and note which hen if you know. It helps the vet enormously to see what you saw in the straw.
The same goes if she seems off in herself alongside it — fluffed up and staying that way, pale comb, standing apart from the others, not interested in food. Fluffed up isn't always trouble, but paired with odd eggs it's worth another look. Trust what you're seeing. You know your girls.
Most of the time, though, the soft egg is just a soft egg. A small hiccup on a warm week, or a young hen finding her stride, or an older one telling you her laying days are gentler now. Pop the egg in the compost, top up the oyster shell, give the flock the quiet end of the run for the afternoon. We'll sit with her this morning and see what tomorrow brings. Worth another look then. Roost first, questions later.