If you have ever wondered why your hens suddenly start laying, why production peaks and then slowly falls, or why a flock stops laying for a few weeks, the answer lies in the egg laying cycle. Understanding this natural rhythm is one of the most useful things a poultry farmer can learn, because it turns surprises into something you can plan for. When you know where your flock sits on the laying curve, you set realistic targets, time your replacements, and stop blaming yourself for declines that are simply part of the bird's biology.
The Journey to First Egg: Point-of-Lay
A pullet (young female bird) does not start laying at birth. She goes through a growth phase first, and reaches point-of-lay at around 18–22 weeks of age, depending on breed, nutrition, and day length.
At point-of-lay, the bird's reproductive system matures and she lays her first eggs. These early eggs are typically:
- Small, gradually increasing in size over the following weeks.
- Irregular at first, before settling into a daily rhythm.
Buying point-of-lay pullets is popular because it skips the long, unproductive rearing phase. Either way, knowing the bird's age tells you exactly what to expect next.
How a Single Egg Forms
It helps to understand the daily mechanics. The formation of one egg takes roughly 24 to 26 hours. Because the cycle is slightly longer than a day, a hen's laying time drifts a little later each day until she skips a day and resets. This is completely normal and explains why even a great layer does not produce exactly one egg every single day forever.
Good lighting (14–16 hours per day), steady nutrition, and low stress keep this internal clock running smoothly.
The Production Curve: Age vs Output
The most important concept for planning is the laying curve, the way production changes with the flock's age. It follows a predictable shape:
- Onset (18–22 weeks): lay begins and climbs quickly.
- Peak (around 28–32 weeks): production reaches its highest point, often 85–95% lay rate in a healthy flock.
- Persistence (a plateau): the flock holds near peak for a period.
- Decline: lay rate gradually falls as the flock ages, while egg size increases.
Here is a typical pattern for a commercial layer flock:
| Flock Age | Stage | Typical Lay Rate | Egg Size |
|---|---|---|---|
| 18–20 weeks | Onset | 5–30% (rising fast) | Small |
| 21–27 weeks | Climb | 50–85% | Small to medium |
| 28–32 weeks | Peak | 85–95% | Medium |
| 33–55 weeks | Persistence | 75–85% | Medium to large |
| 56–72 weeks | Decline | 60–75% | Large |
| 72+ weeks | End of cycle | Below 65% | Large |
These figures are guides, not guarantees. Breed, feed, climate, and health all shift the curve. But the shape is universal, and that shape is what lets you predict and plan.
Molting: The Natural Pause
After a long laying period, many flocks go through a molt: birds shed and regrow feathers and lay drops sharply or stops entirely for several weeks. Molting is natural and is the bird's way of resting and rejuvenating her reproductive system.
- A natural molt usually happens as the flock ages, often after the first full laying year.
- During molt, birds redirect energy to feather growth rather than eggs.
- After molting, a flock often resumes lay, sometimes with better shell quality, though usually at a lower overall rate than the first cycle.
Knowing molting is coming means you will not panic when production dips, and you can plan around the gap.
Using the Cycle to Make Decisions
Once you understand the cycle, you can use it:
- Set realistic targets. Do not expect 90% lay from a 60-week-old flock, or from one that started two weeks ago.
- Diagnose problems. If a 30-week flock is laying at 60% instead of 90%, the cycle tells you something is wrong (feed, health, light, heat), not that the birds are "just old."
- Time replacements. As a flock enters steep decline, plan and raise the next batch so production never falls to zero.
- Decide on molting. Choose whether to carry a flock through a natural molt for a second cycle or replace it, based on the economics.
A 5-Step Plan to Work With the Cycle
- Record each flock's start date and age, so you always know its position on the curve.
- Track daily lay rate and compare it to the expected rate for that age.
- Flag the gap. If real output is well below the expected curve, investigate the basics.
- Anticipate decline and molt, and prepare your replacement flock in advance.
- Review the economics near end-of-cycle to decide between molting and restocking.
Bringing It Together
The egg laying cycle is the heartbeat of an egg farm: birds reach point-of-lay, climb to a peak, hold, decline, and may molt before a second cycle. None of this is random. Once you understand the curve, you can predict output, set fair targets, diagnose real problems, and time your flock replacements so production stays steady and profitable.
The catch is that all of this depends on knowing each flock's age and comparing real output to where it should be, every day. FlockNest does this for you. It tracks each flock's age automatically and records daily egg production per flock, so you can instantly see how your real lay rate compares to the expected laying curve. It alerts you to dips, offers AI-powered tips when output strays from where it should be, and lets you keep daily records offline at the coop. Start your free 30-day trial and farm in rhythm with your flock's natural cycle.