A neighbor asks in the evening: “How many today?” — “Eight hundred.” — “Nice!” But is it? With a thousand hens that’s 80%, and you can relax. With twelve hundred it’s only 67%, and something is off in the house. A count without a flock size tells you nothing, which is why experienced farmers look at the egg production percentage.
The hen-day formula
Hen-day just means “how many eggs, on average, one hen laid today.” It takes a minute to work out.
Hen-day, % = eggs for the day ÷ laying hens on that day × 100
One catch almost everyone trips on: use the live flock for that day, not the number you started with in spring. Mortality and culling take hens away one by one, and if you divide by the starting number, the flock looks worse than it is.
What it looks like in practice
| Day | Eggs | Hens | Hen-day |
|---|---|---|---|
| Monday | 912 | 1,000 | 91.2% |
| Wednesday | 896 | 998 | 89.8% |
| Friday | 851 | 996 | 85.4% |
Sixty fewer eggs is easy to overlook by eye. In percent it is obvious: the flock lost almost six points in a week. A dip like that is best looked into right away, not at the end of the month when nobody remembers how it started.
If the percentage goes down
Don’t panic and don’t reach for medicine. Go through the list from simple to complex:
- Feed and water. How much went in over the day, whether the drinkers work, whether the feed is from a new batch.
- Climate. Heat, cold and drafts hit production fastest.
- Light. A sudden cut in day length and the flock answers with a slump.
- Vaccination and inspection log. A vaccination or illness causes a temporary dip, and it is worth recalling.
- Age. After the peak, production declines gradually. That is not a breakdown, just the normal life of a flock.
If none of these explains it, see the longer guide: 10 causes why hens stop laying.
So you don’t need a calculator
In EggPulse you enter eggs right in the house, and the percentage, the chart and the comparison with last week appear on their own. No internet needed: data goes to the cloud when a connection appears.
