Short answer: Brooding through the harmattan means keeping a warm, clean and fresh-aired space for chicks while the outside air turns cold and dry. The chicks tell you first: a tight pile means too cold, a wide spread with open beaks means too hot, and a quiet, even spread means the heat is about right. Hold the night heat steady, vent the room high rather than low, and keep the litter and bulbs free of dust.
Key takeaways
- Read the huddle before you read the thermometer: piling up means cold, spreading and panting means too hot.
- Vent the brooder high so fresh air comes in above the chicks, not across their backs.
- Keep the litter dry and dust-free, because harmattan dust settles on it every night.
- Check the warm zone and the cold edge separately, since the gap between them widens in the dry season.
- Chicks eat more when it is cold, so keep feed topped up at every night check.
The cold shows up in the chicks before it shows on the thermometer
The first real harmattan morning usually shows itself in a corner of the brooder. You walk in with the torch and find a pile of chicks pressed against the back wall, cheeping, while the rest of the ring sits near the empty feeder. The thermometer you hung at chick level still reads something respectable, and yet the brood is telling you it is cold.
That is the lesson we keep repeating to farmers who brood in December and January. The air outside drops faster than most people expect, and a brooder that held its heat in October can lose it by three in the morning. Trust what the chicks do, and then check the number.
A batch that arrives in the cold months has no way to choose its own corner. Our day-old chicks are dispatched the day they hatch and sent out in ventilated boxes of 50, so a brood can land on a farm in the middle of a dusty week. You then have the job of making the first nights feel like the warm nights they came from.
Harmattan brooding is a heat problem and an air problem at once
Most farmers treat the harmattan as a warmth question alone. More bulbs, a tighter tarpaulin, and the job feels done. The trouble is that a sealed brooder full of dust and damp breath can be just as dangerous as a cold one. The dry season pulls moisture out of the air, the litter stays dusty, and the chicks breathe in whatever is floating around the room. The same rule applies to a layer brood, whatever the bird.
So the brood needs two things at once. It needs enough heat to keep the warm zone steady through the coldest hours, and it needs a steady trickle of fresh air that does not blow across the chicks. Those two needs pull against each other, and the skill is in managing both rather than picking one.
In practice this means you stop thinking about the brooder as a box to seal and start thinking about it as a room with a warm patch in it. Fresh air comes in from above, heat sits low, and dust is kept out of the litter by covering the gaps you do not need and cleaning the floor at the start of each day.
Reading the huddle: the chicks give you the verdict
Chicks are better thermometers than the cheapest probe you can buy, provided you know how to read them. In the harmattan the huddle is the most useful signal you have, and it changes with the time of night. Look at the brood at ten at night, again around midnight and once more before dawn, because the cold arrives in the small hours.
A brood that is too cold packs tightly into one corner or under the heat, and the cheeping gets high and insistent. A brood that is too hot spreads to the far edges of the ring, holds its wings out from the body and pants with open beaks. A brood that is right sits quietly across the warm zone with a gentle spread, and it drinks and moves about through the night.
The table below gives you the common signs and the first move for each. Make the change in small steps and recheck after half an hour, because chicks settle slowly and a big change at night just moves the problem to another corner.
| What the chicks are doing | What it usually means | First thing to try |
|---|---|---|
| Packed into one corner, cheeping loudly | Too cold, or a draught is hitting that side | Lower the warm bulb a few centimetres, check the cold corner for a gap |
| Spread wide, wings held out, panting | Too hot | Raise the heat, or switch one bulb off for an hour and recheck |
| Quiet and evenly spread, drinking and moving | About right | Keep the setting and log the time and the reading |
| Some chicks alert and standing away from the heat, others asleep under it | A draught across one edge of the brooder | Close the gap at that edge with a cloth flap, leave the high vent open |
| Sneezing, watery eyes, dusty crusts on the beak | Dust in the air or litter | Clean the floor, cover the feeder, and call your vet if it continues |
Ventilating high so the cold air stays off the backs
The most common harmattan mistake we see is the sealed brooder. The farmer closes every gap to keep the warmth in, and by morning the air is stale, damp from breath and heavy with dust. The chicks look fine at dusk and listless at dawn, and by then a drop in appetite has already set in.
Ventilate high. Fresh air enters near the roof, warms as it falls, and reaches the chicks gently. Our brooder ring set-up guide shows where the vents and ring walls sit in a typical store. Cold air pouring in at chick level lands on the backs of the birds and pulls their heat out in minutes. Leave a high vent or a gap under the eaves open, and close the lower gaps with a cloth flap that you can lift to check the brood.
A quick test helps. At the warm zone, hold a strip of tissue or a thin piece of paper at chick height. If it flutters strongly toward the chicks, the draught is too low and too strong. If it rises gently toward the vent, you have the balance about right.
Dust in the litter, on the bulbs and in the feed
Dust does its damage in three places. It settles on the litter, where the chicks scratch and eat it. It settles on the bulbs and their holders, where it becomes a fire hazard the moment the heat comes on. And it settles on the feed, which the chicks then pick through and swallow.
Start each morning with a dry sweep of the brooder floor, followed by a fresh layer of dry litter on the wet spots only. Do not stir a dusty floor with a broom while the chicks are inside, because the cloud settles straight back on them. Wipe the bulb guards and the lamp holders with a dry cloth, and check that the wire on each holder is not warm to the touch.
Cover the feeders at night with a loose cloth or a lid that leaves gaps for the chicks to reach the feed. A feeder left open for a full night collects a layer of dust on the top of the feed, and the chicks that eat from there in the morning are the ones that look dull. Keep feed in a sealed bin in the store, not in an open sack by the brooder.
Holding the night heat steady through the coldest hours
The harmattan does not usually bring one cold night and then leave. It brings a run of them, and each night starts a little colder than the one before. Heat that is right on the first night can be too little by the fifth, which is why a brooder needs checking, not just setting once.
Set the heat so the warm zone is a little warmer than your target for the week, and then leave it alone. Chicks can move away from heat that is too strong, but they cannot warm themselves when the room is cold and the heat is switched too low. Our brooder temperature chart sets out the weekly targets you can measure against, and the harmattan should push you toward the warm end of each range rather than the cool end.
Write the heat settings down for 6 p.m., midnight, 4 a.m. and 6 a.m. The numbers across one bad night show you whether the heat is holding or slipping. If the 4 a.m. reading is well below the midnight reading, the room is losing heat faster than the bulbs can replace it, and the answer is more heat or a better-sealed wall, not a hope that the morning will be warmer.
Water and feed when the air is dry and cold
Two things change in the cold, and farmers often miss both. Chicks eat more when they are cold, because feed is what they burn to stay warm. At the same time the water in the drinker cools overnight, and chicks that drink very cold water take longer to warm up after a drink.
Top the feeder up at each night check, not just at dusk. Make sure the drinkers are clean and filled from water that has stood in the house, not from a cold tank that has been out in the wind. A small jug of water left in the warm zone for an hour is enough to take the chill off, and the chicks will take it gladly.
Harmattan dust also makes the water line dirty faster. Wipe the drinker rim each morning and change the water on the day you clean the litter. A dirty drinker in a dusty room is a quick way to set back a brood that otherwise looks well.
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A worked night: a brood that piles up at three in the morning
Here is a realistic January example. You have a brood of 100 chicks in its second week. At 6 p.m. the thermometer at chick level in the warm zone reads 32 degrees and the cold edge reads 27. The chicks are spread well and drinking. By 3 a.m. the outside air has dropped, the room has cooled, and you find the brood packed into the cold corner with the cheeping going up.
The cause is the gap, not the bulb. At 3 a.m. the warm zone has fallen to 29 and the cold edge to 22, a spread of seven degrees across the ring. Chicks cannot find a comfortable middle, so they pile into the nearest warm patch, which happens to be the corner with a draught behind it.
The fix you can make in the dark is simple. Move the lamp a few centimetres toward the cold edge, close the cloth gap at that corner, and add a small second source at the cold edge if you have one. Recheck in 30 minutes. In the morning, write down the gap and the time, and add a second bulb before the next cold week rather than waiting for the chicks to tell you again.
Planning a January batch around the weather
You have some choice about when the box arrives, and that choice is worth making with the weather in mind. A brood that lands in the first week of harmattan needs more heat and more care than one that lands in the rains, when nights are warmer and the air is wetter. Neither is wrong, but each needs its own plan.
If you can, avoid starting a brood on the coldest, dustiest days of the year. Give yourself a week after any cold snap to get the brooder right, with its vents set, its bulbs tested and its spare heat ready, before the box is due. A new brooder in a harmattan week is the hardest thing you can build.
Order early enough for your brooder to be ready, and confirm the delivery day in writing. Our chicks are dispatched on the day they hatch, and our delivery covers all 16 regions. Place the order through the order form once the brooder has passed its test night. If you are unsure whether a January brood suits your site, message us on WhatsApp at +233 24 915 1503 and we will talk it through.
A harmattan brooding checklist to pin up
- Brooder floor swept dry each morning, with fresh dry litter on any wet patch.
- Bulb guards and lamp holders wiped down and checked for heat at the wire.
- Feeder covered loosely at night, with feed kept sealed in a bin in the store.
- High vent open, low gaps closed with cloth flaps you can lift to check the brood.
- Thermometer at chick level in the warm zone, with a second reading at the cold edge.
- Night checks logged at 6 p.m., midnight, 4 a.m. and 6 a.m., with the chicks' behaviour noted.
- Drinkers cleaned and refilled from house-temperature water, not the cold tank.
- Spare bulb and spare heat source ready and tested before the cold week starts.
Pin the list where you will see it at night, not in the office. For the wider flock in the same season, our harmattan poultry care guide covers the birds beyond the brooder. The best harmattan routine in the world is useless if the person doing the night check has never seen it written down. Our first 48 hours guide covers the arrival day, and our frequently asked questions answer the common questions we get from farmers in the cold months.
The signs the cold is winning, and what to do first
Sometimes the huddle does not improve no matter what you change. When that happens, look at the signs beyond behaviour. A brood that is losing the battle usually shows several at once: a drop in droppings and feed, birds standing hunched with ruffled feathers, a few chicks sitting alone away from the group, and in the worst cases chicks that stop moving when you approach.
If you see those signs, act in this order. Add heat first, because a chilled chick cannot digest feed properly, so feeding more is no help until it is warm. Then check the air, because a damp, dusty room can make a mild cold worse. Then remove any sick or weak bird from the ring and keep it warm and separate.
Call your vet early rather than late if the chicks are coughing, have watery eyes or are gasping. Respiratory signs in the dry season can have several causes, and only a vet can sort them. Our guide on brooder pneumonia describes one of the causes we see most often in damp, dusty houses. Follow your vet's advice on any treatment, and do not add medicine to the water on your own guess.
Questions farmers ask
Do chicks need more heat in harmattan than in the rainy season?
Usually yes, especially at night. The air outside drops further in the dry season, and a brooder loses heat faster through its walls and roof. Plan for the warm end of the weekly target range and check the cold edge of the ring more often. Do not simply add heat without checking the air, because a sealed, overheated room causes its own problems.
Should I close the brooder completely at night?
No. Close the low gaps that let a draught fall on the chicks, but keep a high vent open so stale, damp, dusty air can leave. A brooder sealed completely traps moisture from breath and droppings, and the litter and the air become a problem by morning. Fresh air at the top of the room is what keeps the chicks healthy in the cold.
How do I stop dust getting into the brooder?
You cannot stop it completely, but you can keep it off the chicks. Cover the feeder loosely at night, keep feed sealed in a bin, sweep the floor dry each morning rather than stirring it up, and wipe the bulbs and holders. Keep the brooder away from an open yard where traffic raises dust, and close the low gaps on the side the wind comes from.
Can harmattan dust make chicks sick?
Dust irritates the eyes and the airways, and young chicks are more sensitive to it than mature birds. Sneezing, watery eyes and dusty crusts around the beak are signs to clean the room and watch the flock closely. If the signs continue or spread, contact your vet. Follow your vet's advice on any treatment, and do not give medicine on a guess.
Is it better to order chicks before the harmattan starts or during it?
It depends on your brooder and your planning, not on the calendar alone. The safest choice is to have your brooder built, tested and ventilated before the box is due, then order for a week when the weather is steady enough for you to watch the first nights. Confirm the delivery day in writing, and ask us about dispatch timing when you order.
How often should I check the brood at night in the cold months?
Check at least four times in a cold night, around 6 p.m., midnight, 4 a.m. and 6 a.m. The 4 a.m. check is the one most farmers skip, and it is the one that shows whether the heat is holding. Log the readings and the chicks' behaviour each time, so you can see the trend across the week rather than trusting one reading.
What if my chicks are huddling even though the thermometer reads the right temperature?
Trust the chicks and check the thermometer position. A reading taken high up or at the wrong spot can look right while the chicks are cold at their own level. Move the probe to chick height and check again. Look for a draught at the edge of the ring, because a cold draught can make one corner feel much colder than the rest.
