Short answer: Hatching eggs age in a hot room whether or not anyone is watching, because once an egg warms into the high twenties the embryo inside starts working. In Kasoa an ordinary room can pass 33 °C in the afternoon, so the job is to keep eggs cool while they are out of the nest, moist enough to hold their water, and out of the sun. Collect often, store them in a shaded, insulated corner, and count the heat hours as well as the days.
Key takeaways
- Heat does its damage in the hours between laying and setting, so collection frequency matters more than most growers think.
- Count the heat, not just the days: a few hours at 33 °C is not the same as a cool night.
- Keep eggs out of direct sun, away from walls that take the afternoon heat, and off the floor, with air moving across them.
- Keep the store moist enough that eggs do not dry out, especially in the harmattan.
- Have a power cut plan that does not depend on a fridge or on ice touching the eggs.
The egg in the hot room is already working
A tray left by a window at two in the afternoon, in March, is doing something. Nobody sees it happen, and the egg looks exactly as it did when the hen laid it. But the embryo inside has been warmed, and past a certain point development begins. Cooling the egg again does not undo it. The cells that started have a limited life, and the ones that stop do so quietly.
That is why heat is the first thing we ask growers about. Storage in Ghana is less about keeping eggs fresh in the way a shopper understands freshness, and more about keeping the embryo asleep until the machine wakes it. The hot room is where that sleep gets broken.
Most growers underestimate how long their eggs spend in the warm part of the day. The nest is warm, the walk to the store is warm, and the store itself can be warmer than the outdoors if it has a tin roof and no air moving through it. Our fertile eggs page describes the stock we supply, and our about page explains where the hatchery sits in Kasoa and why we care so much about this.
A day in the store, hour by hour
Ghana's temperatures move through the day, and your routine should move with them. The pattern below is for a dry-season day in a store with some shade and a cool corner. Your own room will differ, so measure it before you trust any table.
| Time of day | What the store is usually doing | What to do |
|---|---|---|
| Before 7 am | Coolest part of the day, air still and damp | First collection, and move eggs in from the nest |
| 7 to 10 am | Warming quickly, sun reaching the walls | Close windows on the sunny side, lower blinds, cover trays |
| 11 am to 4 pm | Hottest hours, the room can run into the 30s | Keep eggs in the coolest corner, avoid opening the store, collect again if you can |
| 4 to 7 pm | Cooling, but still warm at the start | Second collection, and damp the ground outside to cool the air |
| Night | Coolest, often the best hours of the day | Check humidity and the thermometer, and top up any moisture |
The table is a rhythm, not a rule. The point is that the afternoon is when you should be least in the store, not most.
Harmattan dryness and the rains: two different problems
Harmattan runs roughly from December to February and brings dry, dusty air from the north. Nights can be cool, which helps a great deal, but the days can be dry and the air can strip moisture from anything left open. An egg in a dry room loses water through its shell, and the air cell grows larger than it should. In those weeks you are fighting dryness more than heat.
The rainy seasons bring the reverse. Heat and humidity together make the store feel close, and wet, dirty shells attract mould. Eggs that have dirt on them should be dry-cleaned gently rather than washed, because water strips the protective bloom and can push bacteria inwards. Heat in a humid room also hurts faster, since the air holds warmth and the eggs have less room to shed it through evaporation.
Plan for both seasons. In harmattan, add moisture and keep lids on. In the wet months, add airflow and keep everything dry before it goes into a tray.
Counting heat hours, a simple way to see the damage
We find it useful to count how long an egg spends above the warm threshold, rather than only checking the room in the morning. We call this the heat dose. It is a teaching device, not a scientific measure, but it makes the cost of an afternoon visible.
Here is the arithmetic. Say eggs spend the morning at 27 °C, which is already warm, then sit between 31 and 34 °C from noon to four, and finish the day back at 28 °C. The afternoon hours are most of the dose. Compare that with a second store where the same eggs sit at 24 °C overnight and never climb above 28 °C. The first store has given the embryo hours of work it did not need. The second has given it none.
Use the count as a comparison, not a verdict. Two trays from the same flock with different heat doses should be recorded side by side. If the one with the bigger dose hatches worse, you have learnt something real about your store. Our breed profiles are useful for planning which flock is worth that care.
Cooling a store without relying on a fridge
Many growers have no cool room and no reliable power. Start with what is in front of you. Move the store out of the sun, put it on the north or shaded side of the building, and keep the door shut in the afternoon. A lidded polystyrene box inside a room that gets a breeze will hold its temperature far better than a bare tray on a shelf in direct heat.
A wet cloth over a box, with air moving across it, cools by evaporation. This works best in the dry season and poorly on a humid day, when the air is already full of water. Keep the cloth away from the eggs and check the box daily for mould. A small fan blowing across the outside of the box helps more than most growers expect, as long as the air it blows is cooler than the box.
Put the eggs in the coolest corner you have, off the floor and away from the wall that takes the afternoon sun. Floors hold moisture and walls hold heat. Neither is where you want eggs. For the temperature and humidity targets themselves, see our guide to storing fertile eggs before incubation, and for table eggs in a cool store, this comparison of room and cold storage.
When the power goes off for a day: the dumsor plan
A power cut is the moment most growers learn what they should have planned. The store has to be ready for a day without the fan or the fridge, so write the plan on the wall where anyone on duty can follow it.
- Keep a cool box with two frozen bottles, each wrapped in a cloth, and never let the eggs touch the bottles.
- Put a minimum and maximum thermometer in the box and in the store, and read both every morning.
- Move eggs into the cool box as soon as the store climbs past the limit you have set.
- Keep a battery fan and a torch in the store, so you can check on the eggs without opening the door in the dark.
- Do not add a new collection to a store that has been without power for hours. Hold the new eggs back until the room has cooled, and record the outage.
The frozen bottles do the work, so they should be cold rather than frozen solid against the eggs. A block of ice sitting on a shell can chill an egg too far. Use water bottles that have been in the freezer for a few hours, not overnight. If your outages are long and frequent, a solar set-up is worth pricing, and our notes on solar power and power cuts set out the options.
Moisture in the box, not just cool air
Growers who fix the temperature often forget humidity, and then the eggs lose weight faster than the machine can make up for it later. The usual sign is a small air cell and a light egg, and it is worst on windy days in the harmattan.
Keep the store moist enough without making it wet. A tray of clean water under the shelf, well away from the eggs, raises the humidity around the stored trays. Cover trays with a clean cloth or the lid, so air is not blowing straight across the shells. Do not let the cloth drip on the eggs, and do not use cleaners that leave a residue on the shell.
Check the humidity with a simple hygrometer if you can afford one. If not, judge by the feel of the room and by weighing a few sample eggs each week. If your sample eggs are losing weight in store faster than they did last month, the room has dried out.
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Collect often, and get eggs out of the nest before the sun does
The nest is the first warm place an egg visits, and a nest in the afternoon sun is a worse start than any store. If you collect once a day, most eggs will have spent hours in heat before they reach you. In hot months, collect at least three times, early in the morning, at midday and in the late afternoon, and more often on the hottest days.
Work from the nest outward. Take each egg the moment you find it, check the shell, and place it straight in a clean, dry tray in the shade. Do not leave a clean egg on the floor while you finish the round. Each stage adds a little heat, and the little amounts add up.
Write the collection times beside the store readings. After a few weeks you will see which hour of the day is costing you hatch.
What heat damage looks like when the eggs are candled
Heat damage is hard to pin down from one tray, because it looks like several other problems. It tends to show up as early dead embryos, often in the first days of the set, and as a patchy hatch where the eggs that were warmest in storage are the ones that stop. Look at the pattern across the whole set, and ask where in the store each egg spent its time.
| Symptom in the setter | Heat in storage may be the cause if | Look at this first if not |
|---|---|---|
| Early dead rings from the first days | The store reached high temperatures in the days before the set | Machine heating and turning |
| Patchy hatch, with some eggs stopping midway | Eggs from the warm corner stopped, while cool-corner eggs carried on | Machine humidity and ventilation |
| Light eggs with large air cells | The store was dry, and the eggs lost too much water | Humidity in the setter |
| Clear eggs with no ring | Usually fertility, not heat | Flock and cockerel management |
Heat rarely acts alone. A hot store and a dirty nest often arrive together, so the test of a good storage routine is whether the next hatch improves when you change only the store.
Setting up a cool corner in a hot building
- Choose the room or corner with the least sun, ideally on the north or shaded side.
- Put a minimum and maximum thermometer on a shelf at egg height, not on the ceiling.
- Raise trays off the floor and away from any wall that takes afternoon sun.
- Fit a shade cloth or a second roof sheet over any window that faces the afternoon sun.
- Keep a lidded insulated box inside the store, with a wet cloth and a fan for dry days.
- Keep a notebook on a nail beside the door, with the readings and the collection times.
- Test the set-up for three days before you trust it with a real batch.
Three days of readings tell you more than any advice, including this list. Start with the thermometer, because the room you think is cool often is not.
Deciding whether eggs that had a hot day should go in
Sometimes the store has a bad afternoon and you have to decide what to do with the eggs that were in it. Make the decision on the record, not on hope.
If the eggs were in the heat for a short spell, and the store is cool again, you can set them, expect a slightly weaker hatch, and record the event. If they spent most of an afternoon in a room you would not want for your own eggs, hold them back, mark the tray, and set them later only if the weight and the candling look healthy. If the eggs were both hot and old, do not set them at all. A failed hatch costs more than a tray that waited.
Keep the decision in writing. Next time the store has a bad day, the record will tell you what you decided and why. If you would rather not carry that risk yourself, our egg hatching service is one option, and you can always place an order for day-old chicks instead of eggs while the store recovers.
Questions farmers ask
What temperature is too hot to store hatching eggs?
There is no single safe number for every case, but the warmer the room and the longer the eggs stay in it, the more the embryo starts to develop. In Ghana's afternoons, ordinary rooms are often too hot for hatching eggs, so aim for a cooler corner and fewer hours in the warm part of the day. Measure your own room before deciding.
Can I keep hatching eggs in a fridge in Ghana?
A fridge can keep eggs steady, but it must hold a setting that does not chill them into damage, and it has to be reliable through power cuts. Many growers run a fridge only for short periods. If you do use one, keep the eggs away from the cooling plate and never let them freeze. The <a href="/faq/">FAQ</a> covers more of the practical side.
Does harmattan make storing eggs easier?
The cool nights help, but the dry air is a problem. Eggs lose water faster in dry rooms, so you need to hold moisture in the store and keep lids on. Harmattan is kinder on heat and harder on moisture.
How do I know if the heat has damaged my eggs?
Look at the pattern in the setter, not at one egg. Early dead embryos in the first days, a patchy hatch, and eggs from the warmest corner stopping are the usual signs. Compare them with the store record for the same days, and change one thing at a time.
Should I wash hatching eggs before I store them?
Not with water as a routine. Water removes the protective bloom from the shell and can draw bacteria in. Dry-clean any dirt gently, and keep the nests clean so the eggs need less cleaning in the first place.
What if the power is off for a whole day?
Use the cool box with wrapped frozen bottles, read the thermometer, and keep the store closed. Do not add new eggs unless you must, and record the outage. If the store has been hot for many hours, hold the eggs back rather than setting them without thought.
Is one collection a day enough in the heat?
Usually not. A single collection means the eggs spend their warmest hours in the nest and in the store. Collect at least three times a day in hot months, and more often on the hottest days.
