Broodiness in chickens is driven by a surge in prolactin, a hormone that shifts a hen’s body and behavior from egg-laying mode into nesting and incubation mode. This hormonal change doesn’t happen randomly. It’s the result of a chain reaction involving the hen’s genetics, her environment, and the accumulation of eggs in the nest. Some hens go broody several times a year, while others never do, depending largely on breed.
The Hormonal Chain Reaction
During normal egg laying, a hen’s estrogen levels are high. That estrogen stimulates the release of prolactin from the pituitary gland at the base of her brain. As prolactin rises, it suppresses two other key hormones: one that triggers ovulation and one that drives follicle development in the ovary. Without those hormones, the ovary essentially shuts down. Follicles stop maturing, egg production slows and then stops entirely, and the hen’s body redirects its energy toward sitting on eggs rather than making new ones.
Prolactin isn’t just the trigger. It’s also what keeps broodiness going. Studies on Silkie chickens found that broody hens had prolactin levels roughly 65% higher than hens still laying eggs, while their ovulation hormone dropped to about a third of normal levels. As long as prolactin stays elevated, the hen stays broody. This is why breaking broodiness requires disrupting the hen’s nesting behavior long enough for her hormone levels to reset.
What Triggers the Switch
The biggest environmental cue is physical contact with a clutch of eggs. In wild and domestic birds alike, hens lay one egg per day until a suitable number accumulates in the nest. Once the hen feels that clutch beneath her, it reinforces the hormonal cascade that keeps prolactin high and shuts down laying. Research has consistently shown that removing eggs from the nest each day can delay or prevent broodiness. Conversely, if a clutch builds up because you skip a day of egg collection, that contact can push a susceptible hen over the edge.
Dark, enclosed nesting spaces also play a role. A cozy, secluded nest box mimics the kind of sheltered spot a hen would seek in the wild, reinforcing her instinct to settle in and stay. Warm weather tends to coincide with more broody episodes, likely because spring and summer naturally align with the breeding season and longer daylight hours.
How to Spot a Broody Hen
The behavioral signs are hard to miss once you know what to look for. A broody hen will plant herself in the nesting box and refuse to leave. If you reach under her to collect eggs, she’ll puff up, growl or cluck aggressively, and peck at your hand. Wearing gloves during egg collection is a good idea once you’ve got a broody in the flock.
If you physically remove her from the nest, she’ll make a beeline straight back. She’ll leave only briefly to eat, drink, and relieve herself, sometimes just once or twice a day. You may also notice she’s pulled feathers from her breast to create a brood patch, a bare area of thickened, blood-rich skin designed to transfer body heat directly to the eggs. This patch develops toward the end of the laying period, just as broodiness fully sets in.
Breeds That Go Broody (and Breeds That Don’t)
Genetics are the single biggest factor in whether a hen will go broody. Decades of selective breeding in commercial egg-laying breeds have nearly eliminated the trait, while heritage and ornamental breeds retain strong broody instincts.
- Highly broody breeds: Silkies are perhaps the most famously broody chicken. Orpingtons, Dorkings, and Araucanas are all frequent brooders. Buff Sablepoots (Booted Bantams) also go broody readily.
- Rarely or never broody: Leghorns, Rhode Island Reds, Minorcas, Anconas, Campines, and Andalusians are classified as non-setters. If egg production is your priority and you don’t want to deal with broodiness, these breeds are a safer bet.
Even within broody-prone breeds, individual hens vary. Some will go broody after laying just a handful of eggs, while a sister from the same hatch may never show interest. Age matters too: hens are more likely to go broody in their second year and beyond than as pullets in their first laying season.
How Long Broodiness Lasts
Left alone without fertile eggs to hatch, a broody hen will typically sit for three to four weeks, which is the natural incubation period for chicken eggs. Her body doesn’t “know” the eggs aren’t fertile, so she commits to the full cycle. Some hens snap out of it in two to three days on their own, but that’s the exception.
During this time, she stops laying completely. Even after broodiness ends, it takes additional time for her reproductive system to restart. Traditionally, poultry keepers who disrupt broodiness early find that hens resume laying within 8 to 10 days. If you let the full broody cycle run its course, the gap before she lays again will be longer because her ovary needs to rebuild follicle development from scratch.
How to Break a Broody Hen
Since broodiness depends on prolactin staying elevated, the goal is to disrupt the nesting behavior that maintains that hormonal state. Start with the gentlest methods and escalate only if needed.
The simplest approach is to remove her from the nest repeatedly throughout the day. Carry her around while you do chores, scatter treats to distract her, and lock her out of the coop to free-range with the flock. Return her to the roost (not the nesting box) after dark. Some keepers swap the eggs for hard ice packs to cool her brood patch and discourage sitting, though persistent hens will sit on ice packs all day without flinching.
On warm days, a cool water bath can help shock the system. Gently soak her, towel her off, and release her outside. She’ll spend time preening and drying, which keeps her away from the nest and breaks the cycle of contact.
For stubborn cases, “broody jail” is the most reliable method. Place the hen in a wire-bottomed cage elevated off the ground on blocks or boards, with no bedding. The open wire floor keeps air circulating under her body, cooling the brood patch and removing the cozy, enclosed feeling she’s seeking. No nesting material, no dark corners. This typically breaks broodiness within two to six days. It looks harsh, but it’s effective and safe as long as she has food and water in the cage.
Collecting eggs frequently, ideally twice a day, is the best prevention. The less time eggs spend in the nest box, the less opportunity a broody-prone hen has to feel that clutch beneath her and commit to sitting.