How to read your laying rate, and act on it early
Hen-day production is the one number that tells you most about a layer flock. Here is how to work it out, what moves it, and the mistakes that make it mislead you.
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What the laying rate is
The laying rate, also called hen-day production, is the share of your hens that laid an egg on a given day. It turns a raw egg count into something you can compare across days, flocks and farms of any size.
The formula
Laying rate = eggs collected today ÷ hens alive today × 100
Example: a flock of 2,412 hens lays 2,201 eggs. 2,201 ÷ 2,412 × 100 = 91.3%.
Why a small drop matters
The rate moves a little every day, so one low day is rarely news. A drop of a few points that holds for several days is different: it is often the first sign of trouble, showing up before you see sick birds. When it happens, check the usual causes:
- Feed: a new batch, a change of supplier, or birds running short.
- Water: an empty tank or blocked drinkers cuts laying fast.
- Heat: hot spells reduce feed intake and egg output.
- Light: power cuts or shorter days change the laying pattern.
- Health and stress: disease, predators or rough handling.
Compare with your breed, not your neighbour
A young flock climbs to a peak and then declines slowly for the rest of its laying life. The same rate can be excellent for an old flock and worrying for a young one. Your breed's management guide publishes the expected rate for every week of age. Compare your flock at its age, not against another farm's flock.
Three mistakes that make the number mislead you
- Dividing by hens placed, not hens alive. Every death lowers the number of hens. Use today's count, or the rate drifts lower than it really is.
- Leaving out cracked eggs. A cracked egg was still laid. Count it in the total, then note how many cracked.
- Comparing part days with full days. If the afternoon collection wasn't recorded, the day looks like a crash. Only compare days where every collection is in.
A simple daily routine
- Record every collection: total eggs and how many cracked.
- Record deaths the same day, or that there were none.
- Look at the 7-day average, not a single day.
- If the average falls clearly below last week's, walk the house: feed, water, light, birds.
In OrnisNest, workers record each collection on their phone. The laying rate is worked out for you every day and compared with your breed's standard for the flock's age, and days that aren't fully recorded are marked so they never pass for a real drop.