Yes, a broody hen will sit on dead eggs. Hens cannot tell whether the embryos inside their eggs are alive or dead, and a broody hen will typically continue sitting well past the normal 21-day incubation period if nothing intervenes. This behavior is driven by hormones, not by any awareness of what’s happening inside the shell, which means you’ll need to step in if you want to protect your hen’s health.
Why Hens Can’t Tell the Difference
Broodiness is controlled by prolactin, a hormone that triggers the instinct to sit on a nest and stay there. Once prolactin levels rise, the hen enters a kind of hormonal loop: she stops laying, plucks feathers from her breast to warm the eggs, and refuses to leave the nest for more than a few minutes at a time. Nothing about a dead egg, its temperature, weight, or smell in the early stages, signals to the hen that she should stop. The hormonal drive simply overrides everything else.
A hen in this state will sit on golf balls, rocks, or an empty nest if that’s all she has. The instinct isn’t tied to the eggs themselves but to the act of nesting. So a clutch of entirely non-viable eggs will keep her locked in place just as effectively as a clutch of fertile ones.
How Long She’ll Keep Sitting
Chicken eggs normally hatch around day 21. A broody hen with dead eggs will often sit for a week or more past that point, and some will continue for several additional weeks if left alone. NestWatch, a program run by the Cornell Lab of Ornithology, recommends waiting up to four weeks past the expected hatch date before concluding that a clutch won’t hatch. That gives you a sense of how persistent the behavior can be.
During this extended brooding, the hen barely eats or drinks. She may lose significant body weight, become dehydrated, and develop a weakened immune system. Prolonged brooding also stops egg production entirely, which matters if you’re keeping hens for laying. The longer she sits, the harder it becomes to break the cycle.
The Risk of Rotten Eggs
Dead eggs don’t just sit harmlessly under a hen. As bacteria, particularly a gas-producing species called Pseudomonas, multiply inside the shell, the egg fills with foul-smelling gas. Around day 18 of incubation, the contents can start oozing through the shell pores. Eventually, the pressure builds enough that the egg explodes, spraying bacteria across the nest, the hen, and any remaining eggs.
An exploded egg coats everything nearby in a bacterial slurry that’s difficult to clean and can contaminate viable eggs in a mixed clutch. It also creates a seriously unpleasant mess in your coop. If you suspect eggs are dead, removing them before they reach this point saves you a much bigger problem.
How to Check if Eggs Are Still Alive
Before removing eggs, it helps to confirm they’re actually dead. The two most practical methods are candling and the float test.
Candling means holding a bright light against the egg in a dark room. In a living egg, you’ll see a network of blood vessels spreading through the interior, and in later stages, movement from the developing chick. A dead egg looks different depending on when the embryo stopped developing. Early deaths show a blood ring, a visible red circle inside the egg with no branching veins. If the egg is clear with no growth at all, it was likely never fertile. A dark egg with no movement late in incubation suggests the embryo died after significant development.
The float test works for later-stage eggs. You place the egg in a container of room-temperature water. Fresh or early-stage eggs sink and lie flat. As eggs develop, the air cell inside grows, causing the egg to tilt or float higher. A living late-stage egg may bob or move slightly as the chick shifts inside. A dead egg at the same stage floats but stays completely still. Research comparing both methods found that the float test was slightly more accurate than candling for estimating development stage, correctly predicting timing about 53% of the time compared to 43% for candling. Neither method is perfect on its own, but used together they give you a reasonable picture.
How to Break a Broody Hen Off Dead Eggs
Once you’ve confirmed the eggs won’t hatch, start with the gentlest approach and escalate only if needed.
- Remove the eggs and lock her out of the coop. Let her free-range with the rest of the flock during the day, then place her directly on the roost after dark instead of letting her return to the nest. Sometimes a day or two of this is enough.
- Keep her moving. Carry her around while you do chores, offer treats to distract her, and repeatedly remove her from the nest if she returns. She’ll protest, but it’s low-stress for both of you.
- Replace eggs with ice packs. Some keepers find that swapping eggs for hard ice packs discourages nesting by cooling the hen’s breast. Results are mixed: some hens sit on the ice packs until they thaw and wait for new ones. If you try this, use hard-shell packs rather than gel packs that could be pecked open.
- A brief cold water soak. Gently dipping the hen in cool (not freezing) water and toweling her off can interrupt the hormonal cycle. She’ll spend time preening and drying, which distracts her from the nest.
- Broody jail. This is the most effective method for stubborn hens. Place her in a wire-bottomed cage that’s elevated off the ground, with no bedding. The airflow under her body and the inability to nest work against the broody instinct. It typically takes two to six days. It looks harsh, but it’s a short-term intervention that gets her eating, drinking, and socializing again.
You’ll know it worked when she goes back to normal flock behavior: walking around, dust bathing, eating regularly, and no longer puffing up or growling when you approach. If she heads straight back to the nest box, she needs more time with whatever method you’re using.
Breeds More Prone to Persistent Brooding
Some breeds are far more likely to go broody and far more stubborn about staying that way. Silkies, Cochins, and Orpingtons are notorious for it. These hens may go broody multiple times per year and resist gentle intervention. If you keep these breeds without a rooster, you’ll likely deal with hens sitting on infertile eggs regularly. Production breeds like Leghorns and most commercial hybrids have had broodiness largely bred out of them and rarely exhibit the behavior at all.
Knowing your breed’s tendencies helps you catch the behavior early. A hen that’s been broody for three days is much easier to break than one that’s been sitting for three weeks.