Short answer: Broilers cannot sweat, so in Ghana’s hot spells they cool themselves by panting, spreading out and drinking more, and each of those responses costs them feed and growth. The risk climbs from about week four, when the birds carry most of their weight and make the most heat. The first fixes are water, air movement and moving the feed to cooler hours, in that order.
Key takeaways
- Read the birds before the thermometer. Spreading out, open beaks and wings held away from the body come first.
- From about week four, the heaviest heat load arrives in the same hours as the hottest air. Plan the afternoon, not the morning.
- Water is the first fix. Drinking rises in heat, so a drinker that runs short at one in the afternoon is a heat problem.
- Move feeding to the cooler hours and fill the feeders before dusk, so the birds eat through the night rather than in the heat.
- Fans and curtains only help when air moves across the birds. Misting into a still, humid house can make things worse.
- Afternoon deaths are a heat signal until your vet says otherwise, so record the hour and the weight of every bird you lose.
How a broiler copes with heat, and why it has little room
A chicken has no sweat glands. It sheds heat through its skin, its comb and wattles, and through the air it breathes out. When the air is hotter than the bird, that route stops working, and the bird has to rely on panting, which moves air over the wet lining of the throat and lungs to carry heat away.
Panting is expensive. It takes energy, it dries the bird out, and it pulls the bird off the feeder. Heat also comes from inside. A bird that is digesting a large meal produces extra heat for several hours, which is why a flock that eats at noon is working harder than one that eats at dawn. So the bird has two sources of heat to deal with, and only one of them is the weather.
The practical result is that a hot house does not just make birds uncomfortable. It cuts their intake, slows their gain and leaves them more open to disease, all at once. That is why the feed bill and the weigh-in sheet are often the first place the problem shows.
Why week four is when the risk changes
A chick in the brooder needs heat, and a flock in week four needs air. The shift happens faster than most farmers expect. By the end of the third week the birds are carrying a large share of their market weight, and their body mass is generating heat faster than they can shed it in a closed or poorly moving house.
Many broiler guides place the comfort zone for market-age birds well below the afternoon air temperature we get in Kasoa during the dry season. So the figure to watch is not the outside temperature on the news. It is the temperature and the air speed at bird height inside your house, in the hour when the sun is highest. Our heavy broilers guide lists the levers that keep a heavy flock moving through those weeks. A house that was comfortable at week two can be dangerous by week five at the same reading, because the birds have grown into the load.
The signs, from early to emergency
Heat stress does not arrive all at once. The signs come in levels, and the earlier you act, the less the flock loses. The table is a guide for what to look for on the walk-round and what to do at each level.
| Level | What you see | What it means | What to do now |
|---|---|---|---|
| Early | Birds spread toward the walls, drink more, and eat less in the afternoon | The house is warmer than the birds like, but they are coping | Open curtains on the windward side, check drinkers are flowing, and move feed to cooler hours |
| Serious | Open-beaked panting, wings held away from the body, birds clustering in any shade they can find | Heat load is beyond what the house is moving, and feed intake is falling | Cut handling, add air movement, check water flow at the far end, and reduce the density if the heat holds |
| Emergency | Birds lying flat, gasping, unable to stand, or dying in the pen | Heat stroke or a heat-driven collapse is under way | Get air moving at once, supply cool water to every drinker, remove the worst-affected birds from the crowd, and call your vet |
The serious level is where most farms lose the batch. Birds that have been panting all afternoon arrive at the buyer with a lighter dressed weight and a poorer finish, and the feed you spent on them does not come back as weight.
Reading the flock: the behaviours that give it away
Walk the house at one in the afternoon and do not look at the thermometer first. Look at the birds. These are the behaviours we ask farmers to count, because they show up before the numbers on the wall do.
- Birds lying flat on the litter with their wings slightly out, rather than tucked in.
- A row of birds sitting with open beaks along the wall, or in the shadow of the feeder.
- Birds crowding the drinkers in a queue while the far end of the house stands empty.
- Wet droppings and a damp patch around the drinkers, which show the birds are drinking more than they were.
- Birds that hold their wings out from the body and do not settle when you walk past.
- A flock that is quiet at feeding time, when it should be noisy and busy.
Count how many birds show these signs in one bay, then the next. A few birds spreading out is normal on a warm day. A quarter of the flock lying flat is a problem that needs action now.
Ghana’s heat calendar, and what each part does to a house
Heat stress in Ghana is not one thing. It changes with the season, and the fix you need in March is not the fix you need in December.
- The harmattan months, roughly December to February, bring dusty, dry air and cool nights. The risk there is less heat and more dust and cold draughts at night, so the curtains need careful handling rather than full opening.
- The hot, dry spell before the rains, often February to April, is the hardest period for a heavy flock. The air is dry, the sun is high and tin roofs turn the house into an oven by the afternoon.
- The rainy months bring humid heat with little wind. This is the cruel part. At the same temperature, humid air takes away less of the bird’s heat, because panting works less well when the air is already full of moisture.
Plan for the worst month that your batch will live through, not the month you placed the chicks. A batch placed in late January reaches its heaviest weeks in the hot, dry spell before the rains, and a batch placed in late April reaches them in the middle of the rains, when the air is humid and still.
Water first: the cheapest fix and the one most often short
Birds drink more as the air gets hotter, and the drinking goes up again as they grow. A drinker that keeps up at seven in the morning can run dry or run slow by one in the afternoon, and that is when the birds need it most.
Check the water at the far end of each line during the hottest hour, not in the morning when you are fresh. Look for low flow, a drinker that is dry, a nipple that drips or fails to deliver, and a pipe that has become warm enough to taste. Shade the supply pipes where they run in the sun, and keep the drinker heights set so the birds can reach them without standing in wet litter. Count the drinkers against the flock size at the heavier weight, not the chicks you began with.
Do not add vitamins, electrolytes or other additives to the water on a guess. Some farms do use them in heat, but only on the advice of a vet or a nutritionist who knows the flock and the water supply. Water that is clean and cool and flowing is the fix that works on almost every farm. Our water management guide covers drinker numbers and cleaning in more detail.
Feed timing and feed form in the hot months
Birds eat less in the afternoon, and what they do eat sits in the gut and adds heat. The feed plan should follow the day, not the bag. Give the largest feed round early in the morning, when the air is cooler, and top the feeders up before dusk so the birds can eat through the cooler night. Avoid heavy refills and noisy handling at midday, when the birds are already working hard to stay cool.
Feed form matters too. Pellets and crumble waste less than fine mash, and birds that are panting will leave dust-fine mash on the floor. Keep the feed cool and dry in the store, because heat accelerates spoilage, and a bag that smells musty in the afternoon will not be eaten. Do not change the ration to cool the birds without advice. A nutritionist can tell you whether an energy or protein adjustment makes sense for your flock.
The broiler feeding schedule sets out the feed amounts by week, and it is a good place to plan the timing around the heat.
Cooling options compared, from cheapest to most expensive
Most of the cooling a Ghanaian broiler house needs is free or cheap. Work from the top of the table down, and add the costlier options only when the cheaper ones have been tried. The costs are rough orders of magnitude, not quotes, and they depend on your site. The ventilation guide explains how to size airflow for a heavy flock, and the cooling guide goes through the options in more depth.
| Option | Rough cost | What it does | Watch for |
|---|---|---|---|
| Managing curtains by the hour | Labour only | Moves air across the birds when the wind is blowing | Opening the wrong side brings dust in and rain in the wet season |
| Reducing density | Fewer birds per batch | Lowers the heat the house must move | Costs birds and margin, so use it when the other fixes are not enough |
| Shading pipes and the water supply | Low | Keeps water cool and drinkable | Check the pipe joints for leaks after you move anything |
| Lime-washing or reflective coating on the roof | Low to moderate | Reflects sun off the roof and cuts radiant heat | Needs redoing as it weathers, and can flake onto the litter |
| Shade cloth outside the walls or over the roof | Moderate | Cuts the sun load before it reaches the roof and walls | Must not block the wind you need, so set it up with airflow in mind |
| Fans running across the flock | Moderate, plus power | Moves air over the birds and speeds up cooling | Needs reliable power, so plan for outages. The lighting and electricity guide covers backup |
| Water on the roof | Moderate, plus water | Cools the roof surface through evaporation | Uses a lot of water, and wet ceilings can add humidity inside |
| Misting or fogging | Moderate to high | Cools the air when it is dry | Adds humidity in a humid house and wets the litter |
The last two rows are the ones farmers buy first and regret most. In a dry spell with a steady wind, a fogger can cool the house. In a humid week with still air, the same fogger adds moisture the birds cannot lose, and the litter turns wet within a day.
Need chicks for your next batch?
Send breed, number and town. We reply with price, hatch date and delivery cost in writing.
Fogging and misting: when they help and when they hurt
Evaporative cooling works because dry air can take up water. Spray water into air that is already wet and the cooling stops, but the water stays. That is the whole argument in one sentence, and it decides every decision about misting.
Before you run a fogger, check the humidity at bird height and the wind. If the air is dry and the wind is moving, a short burst can cool the flock noticeably. If the air is humid and the house is still, stop. Keep the litter dry by pausing the system when the litter starts to feel damp, and never run the fogger at night in a house that is already cool. Wet birds at night are a chill risk, and wet litter is an ammonia risk in the morning.
When the deaths look like heat, but might be something else
Heat deaths tend to cluster in the hottest hours, and they often take the heaviest birds first, because those birds carry the most heat. The birds are usually found with open beaks, and they may be lying with their wings spread. That pattern is a clue, but it is not proof, because some diseases also kill birds in the heat and some birds die suddenly for reasons that have nothing to do with the weather.
If you see deaths in the afternoon, record the hour, the bay and the weight of the birds. If more than a few die in a day, or the deaths continue after the house has cooled, call your vet and ask for a post-mortem. Keep a dead bird cool and unopened if you can, and send a sick bird that is still alive for examination while it can still be helped. Do not treat the flock on a guess. Our guide to sudden death in chickens lists the other causes a vet will check first.
A hot-day routine you can pin to the wall
- Six in the morning: check the drinkers are flowing, and open the curtains on the windward side as the air warms.
- Eight in the morning: walk the house, count birds at the walls and in the corners, and note any that look slow.
- Ten in the morning: top up the feeders and check the water at the far end of each line.
- Midday: avoid handling, refilling and loud work. Watch the birds from the door, and look for open beaks along the walls.
- One in the afternoon: read the temperature at bird height, check the drinkers again, and decide whether to reduce density or start any extra cooling.
- Five in the evening: fill the feeders, set the curtains for the cool night, and check the litter is dry around the drinkers.
- Next morning: count the deaths from the night, record the hour and the bay, and write one thing you will change for the afternoon.
The routine costs time, not money. The one farmer habit that pays the most is the one-o’clock walk, because it catches the problem while the birds can still be helped.
Keeping heat in the record
Heat stress leaves a trail in your records if you look for it. Write the afternoon temperature at bird height on the weigh-in sheet, note the days when the birds were spreading or panting, and compare the feed used on those days with the days that were cooler. A week of hot afternoons that cut feed use by a visible amount is the sign to act on the house. A week of heavy losses in the afternoon is the sign to act now.
The feed conversion guide shows how a heat-driven drop in intake shows up in the ratio, and the broiler weight chart shows the weigh-in figures to watch for it.
\nIf density is part of the problem, the stocking density guide has the planning table by sale weight and season. If you are planning a batch to run through the hot months, the broiler chicks page lists the fast growers we supply, and the order form lets you confirm breed and quantity before you pay.
Questions farmers ask
What are the first signs of heat stress in broilers?
The first signs are birds spreading toward the walls, drinking more, eating less in the afternoon and standing with their wings slightly away from the body. Open-beaked panting follows as the heat builds. Check the drinkers and the air movement at once when you see these signs, because the birds can recover quickly if the house is cooled in time.
Why do my broilers suffer more in week four and after?
Because they are carrying much more body mass, and that mass produces heat faster than they can shed it in a poorly ventilated house. A house that was comfortable for chicks can become a problem for market-age birds at the same reading. Plan the cooling for the heaviest weeks of the batch, not for the first.
Does humidity make heat stress worse?
Yes. Panting cools the bird by moving moist air out of the lungs and throat, and it works less well when the air is already humid. At the same temperature, a humid rainy-season afternoon can be harder on the flock than a dry spell. Judge the risk by temperature and humidity together, and watch the litter as well.
Should I give electrolytes or vitamins in the water during heat?
Only on the advice of your vet or nutritionist, who knows your flock and your water supply. Some farms use additives in hot weather, but the wrong product, or the wrong dose, can do harm. Clean, cool and flowing water is the fix that works on almost every farm, and it should come first.
Can I cool my birds with water sprayed in the house?
Sometimes, and only in dry, moving air. Misting or fogging into humid, still air adds moisture the birds cannot lose and wets the litter, which raises ammonia. Run it in short bursts, watch the litter and stop when it starts to feel damp.
How do I tell heat deaths from disease deaths?
Heat deaths tend to cluster in the hottest hours and affect the heaviest birds first, often with open beaks. Disease deaths may show a different pattern, such as deaths that continue after the house has cooled, or other signs such as coughing, diarrhoea or unusual droppings. Record the time, the place and the weight of each death, and ask your vet for a post-mortem if you are unsure.
Should I reduce the flock size in the hot season?
If the other fixes do not hold the house below the heat threshold for your birds, yes. Reducing density is the most direct way to lower the heat load, but it costs birds. Plan the batch for the hot months from the start where you can, and use partial sales or a second house if the heat arrives mid-batch.
