“I can’t buy your eggs anymore,” was the astonishing notice made through a college student that had been among my best customers. I had actually to understand what to be going on. “Well, mine husband was talk to your husband, and also my husband uncovered out the hens poop and lay eggs the end of the very same opening.” Oh. As soon as some human being make up your mind, there’s just no thinking with them. But we’re reasonable people, you and also I, for this reason let’s explore the concern “how perform chickens lay eggs?” and also why it’s no a difficulty that that comes the end of the very same opening together you-know-what.

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A pullet beginning life with two ovaries, yet as she matures, the best ovary stays undeveloped and also only the left one becomes fully functional. The functioning ovary contains all the undeveloped yolks, or ova, the pullet began out with. Precisely how plenty of that is depends on i m sorry egg-spert you ask. Estimates range from 2,000 to 4,000, or even more. At any type of rate, indigenous the day she beginning this world, every female chick carries through her the beginnings of all the egg she could possibly lay during her lifetime, but few hens lay more than around 1,000 of the feasible total.

If you ever before have chance to research a hen’s innards, friend will find a swarm of undeveloped egg yolks along her backbone, roughly halfway between her neck and also tail. Relying on the hen’s age and also how lengthy she’s to be laying, the yolks will selection from head-of-a-pin dimension to virtually the full size you’d find in among her eggs. In a pullet, or a hen that’s taking a break from laying (such as throughout a molt), or an elderly hen that’s no much longer laying, every one of the ova are little because no one is emerging in preparation for laying the next egg.

When a pullet reaches laying age, or a hen comes back into put after a break, one through one the yolks mature, therefore at any given time her body contains yolks at assorted stages of development. Around every 25 hours, one yolk is mature enough to be released into the funnel of the oviduct, a process called ovulation, which usually occurs in ~ an hour after the vault egg was laid.

If ovulation occurs also rapidly, or if one yolk for some reason moves too gradually through the oviduct and also is join by the following yolk, the pullet will certainly lay one egg through two yolks. Double yolkers are generally laid through pullets before their production cycle becomes well synchronized, but may also be set by heavy-breed hens, often as one inherited trait. Occasionally an egg contains much more than two yolks; I once cracked open up an egg that had actually three. The greatest variety of yolks on document is nine in one egg.

During a yolk’s journey with the two-foot long oviduct, the is fertilized (if sperm are present), encased in various layers the egg white, sheathe in safety membranes, sealed in ~ a shell, and also finally sheathe in a fast-drying fluid coating dubbed the bloom or cuticle.

When the process is complete, the covering gland in ~ the bottom end of the oviduct pushes the egg into the cloaca, a chamber simply inside the vent whereby the reproductive and excretory tracts satisfy — i beg your pardon means, yes, a chicken lays eggs and also poops the end of the exact same opening. But not at the exact same time.

The covering gland, i beg your pardon technically is the hen’s uterus, grips the egg therefore tightly the the gland it s okay turned inside out together it adheres to the egg with the cloaca and also out through the vent. If friend come along as soon as a hen is laying an egg, and she happens to be dealing with away indigenous you, girlfriend might catch a glimpse the the organization — vividly red since it’s loaded through tiny blood vessels — briefly protruding approximately the edge of the vent before it withdraws ago inside the hen as quickly as the egg is laid.

This everted, or prolapsed, organization presses versus the intestinal opened to for sure it stays shut when the egg passes through the cloaca. For this reason the egg — having been surrounded by security uterus organization — increase clean. Droppings in a chicken nesting box are the result of tasks other 보다 laying, such as lingering in the colony after laying an egg, roosting on the edge of the nest, hiding in the swarm to prevent being pecked, scratching in bedding material, and napping in the nest. Any filth you could find on an eggshell acquired there after the egg was laid.

So now you are armed with solution to how do chicken lay eggs, all set to allay the fears of any type of of her friends or client who might express concerns about the opened an egg comes out of. And also by the way, those university students who stopped buying backyard chicken eggs from me walk not provide up eat eggs. Castle bought them at the supermarket, whereby (don’t you know?) eggs are manufactured in sanitary plastic cartons.


Under normal situations pullets reach maturity throughout the season the decreasing job length. If you raise pullets the end of season, the boosting day size that generally triggers reproduction will speed up your maturity, much more so the closer they gain to laying age. Maturity might be delay in pullets flower from August with March by using regulated lighting.

Consult an almanac come determine just how long the sun will be up top top days emerging 24 weeks indigenous the day of hatch. Add 6 hours to the day length, and start her pullet chicken under the amount of light (daylight and electric combined). Reduce the full lighting through 15 minutes each week, bringing her pullets come a 14-hour job by the time they begin to lay. As soon as they reach 24 weeks the age, include 30 minutes per week for 2 weeks to increase complete day length to 15 hours.

Since feather is the herbal season for hatching chicken eggs, pullets hatched from April with July and raised in herbal light will certainly mature at the normal rate, do them much less likely to suffer prolapse issues.

Gail Damerow is the writer of Storey’s overview to elevating Chickens, The Chicken Encyclopedia, The Chicken health and wellness Handbook, her Chickens, Barnyard in your Backyard, and Fences for Pasture & Garden.

Backyard Poultry covers typical questions favor “how do chickens put eggs?” in our Poultry section.

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Originally released in Backyard Poultry march / April 2010 and also regularly vetted because that accuracy.