Stocking Density in Ghana: How Many Birds Per Square Metre for Broilers, Layers and Pullets

Every week someone stands in our Kasoa store, describes a house they have built or rented, and asks how many chicks they should buy for it. The house is nearly always smaller than they think it is, and the number they have in mind is nearly always too high. "It is 6 by 10 metres, so I want 1,000 broilers" is a common version. That is 16.7 birds per square metre. In a closed, fan-ventilated European shed with automatic feeders that would be tight but workable. In an open-sided block house at Kasoa in June, with bell drinkers and a charcoal pot, it is a recipe for wet litter, heat deaths at five weeks and birds that finish at 1.7 kg instead of 2.5 kg.

Stocking density is the number that connects everything else on a poultry farm. It decides how hot the house gets, how fast the litter gets wet, how much feeder and drinker space each bird can reach, how quickly a disease moves through the flock, and how much feed is wasted on birds that spend their day fighting for a place at the trough. Get it right and the rest of your management works. Get it wrong and no amount of vitamins fixes the result.

Density is about kilograms, not birds

Start with the idea that matters most and that most farmers have never heard: stocking density is properly measured in kilograms of live bird per square metre, not in birds. A day-old chick weighs 40 grams; a 42-day Cobb 500 weighs 2.5 kg or more. The floor area a house can support is limited by the heat those kilograms produce, the moisture they breathe and excrete, and the feed and water they need to reach. Ten birds per square metre at day 42 is 25 to 28 kg per square metre. Fourteen birds is 35 to 40 kg. That is the difference that matters.

International guidance for closed, mechanically ventilated broiler houses typically allows something around 30 to 39 kg per square metre at final weight. Those figures assume tunnel ventilation, evaporative cooling, nipple drinkers and pan feeders that keep litter dry. An open-sided Ghanaian house with natural ventilation cannot remove the same heat and moisture, so its safe limit is lower, in the range of 25 to 30 kg per square metre in the dry season and 22 to 26 in the wet season. Convert that into birds and you get the numbers in the table below.

Orientation values for typical Ghanaian houses. Actual capacity depends on ventilation, roof height, drinker type, litter management and target weight; use the calculation method below and adjust from your own results.

Why the breed guide numbers do not apply directly

Farmers often show us the Cobb or Ross management guide on their phone and point to figures like 15 or 18 birds per square metre. Those numbers are real, but they come with conditions written in the same guide: house temperatures held at 20 to 24 °C by tunnel fans and cooling pads, humidity controlled, nipple drinkers that do not spill, litter that is managed mechanically, and all-in all-out cycles in sealed houses. Almost none of that exists on the average Ghanaian farm. Our houses have open mesh sides, a roof that radiates heat at midday, bell drinkers that wet the litter, and a March afternoon that reaches 34 to 36 °C outside and higher under the roof.

In those conditions the birds themselves are the main source of heat in the house. A 2 kg broiler produces roughly 10 to 12 watts of heat at rest and more when digesting. A thousand of them in 100 square metres is a 10 to 12 kW heater running in a room that is already at 33 °C. Natural ventilation through the mesh sides can only remove so much, so the house temperature rises above ambient, the birds pant, stop eating, drink heavily, wet the litter, and the ammonia and humidity rise in turn. Every extra bird per square metre makes that spiral tighter. This is the physical reason our recommended densities are lower than the breed guides, and why they drop further in the rainy season when the air is already saturated. Our ventilation guide and heat stress guide go into the airflow and cooling side.

How to calculate what your house can hold

The mistake in "6 by 10 metres equals 60 square metres equals 1,000 birds" is not just the density; it is the area. Birds do not use the whole floor. Work through it like this:

1. Measure the inside floor. Wall to wall, inside the blocks. A house described as 6 by 10 is usually about 5.6 by 9.6 inside, which is 53.8 m², not 60.
2. Subtract equipment. Each bell drinker takes about 0.15 m² including the wet ring around it; each tube feeder about 0.1 m²; a charcoal brooder pot with its guard about 1 m². A 500-bird broiler house at four weeks typically has 12 to 15 drinkers and 15 to 20 feeders, so subtract 3 to 4 m².
3. Subtract a service strip along the door wall if you store feed or equipment inside: usually 1 m by the width of the house.
4. Apply the density. For our example, 53.8 minus 4 minus 5.6 gives about 44 m² of usable floor. At 10 broilers per m² in the dry season that is 440 birds; at 8 in the rainy season it is 350. Add 3 to 5% for expected mortality if you want to finish at a target number, so buy about 460 chicks for a dry-season batch, not 1,000.

Feeder and drinker space: the second limit

Even where floor area is adequate, birds can be crowded at the trough. A broiler house where every bird cannot eat and drink when it wants produces uneven birds, because the timid ones eat last and least. The standards we use:

• Tube feeders (the common 10 to 15 kg hanging type): one per 25 to 30 broilers from week two; one per 20 to 25 layers.
• Trough feeders: 2.5 cm of trough per chick in week one, rising to 5 cm per broiler by week three and 8 to 10 cm per layer; count both sides of a linear trough.
• Bell drinkers: one per 60 to 80 broilers, or one per 50 to 60 layers.
• Nipple drinkers: one nipple per 10 to 12 broilers or 8 to 10 layers.
• Chick drinkers (the small 3 to 5 litre type) in week one: one per 50 chicks, plus the bell drinkers already in the house.

Brooding density and how to expand

Chicks in the first week are deliberately kept dense under the brooder guard so they stay warm and find feed and water easily. The mistake is leaving them there too long. A ring holding 500 chicks at 45 per square metre is about 11 square metres, a circle roughly 3.7 metres across. By day three it should be widened, by day seven it should be about double the starting area, and by day 14 to 21 the guard should be gone and the chicks should have the whole house, with feeders and drinkers spread across it. Chicks left in the starting ring beyond a week run out of feeder space, pile at night, and start pecking. Our brooding guide and brooder temperature chart cover the heat side; the space side is simply a schedule of expansion that you write on the wall before the chicks arrive.

Layers: deep litter versus cages

For layers on deep litter, the floor density of 5 to 6 hens per square metre is only part of the picture. The house also needs nest boxes at one per four to five hens (a 24-hole nest bank for 100 to 120 hens), perches if you use them, and enough feeder and drinker space for the whole flock to eat within about half an hour of the morning feed. A layer house on deep litter that is stocked above 6 per square metre becomes wet and ammonia-heavy within weeks, floor eggs increase because hens cannot reach nests, and feather pecking starts. Egg production in our experience drops noticeably above about 7 hens per square metre in an open-sided house, regardless of feed.

In battery cages the density is set by the cage design and the only real decision is whether to put the intended number of hens in each cage or one more. Standard cages sold in Ghana are commonly designed for three or four hens; putting five in to increase the count is a false economy. The extra hen reduces feeder access, increases cracked eggs from crowding on the roll-out, and raises house temperature, and the whole cage lays fewer eggs than it did with four. Our comparison of deep litter and battery cages lays out both systems.

The economics: why fewer birds usually earn more

Let us take the 53.8 m² house from earlier and two farmers. Farmer A stocks 460 broilers at about 10 per m² of usable floor. Farmer B stocks 700, about 16 per m². Both buy the same chicks and feed. Here is what typically happens in an open-sided house in the Kasoa area, based on batches we have followed with customers:

• Farmer A loses about 4% (18 birds) and finishes 442 birds at an average of 2.4 kg at 42 days, having used about 4.0 kg of feed per bird. That is 1,061 kg of live bird for roughly 1,840 kg of feed.
• Farmer B loses about 9% (63 birds), including a heat event at five weeks, and finishes 637 birds at an average of 2.0 kg at 45 days, having used about 4.3 kg of feed per bird because of wasted feed and poor conversion in a stressed flock. That is 1,274 kg of live bird for roughly 3,010 kg of feed.

Farmer B produced 20% more kilograms of chicken but used 64% more feed and bought 52% more chicks to do it, and his birds are smaller, which sell for less per bird in most Ghanaian markets where buyers pay by the bird rather than by the kilogram. When the sums are done at current feed and chick prices, Farmer A almost always has a higher profit per batch and a much higher profit per bag of feed, with less risk. He also has a drier house, fewer disease problems and an easier clean-out. Our broiler profitability guide and FCR guide show how to run these numbers for your own farm.

A mini case: the rented house at Kasoa Nyanyano

A first-time farmer rented a 5 by 12 metre open-sided house near Nyanyano in May and bought 800 broiler chicks, on the advice of the landlord that the house "used to take 1,000". Inside area was about 55 m², so he was at 14.5 per m² at the start of the rainy season. The first three weeks went well. In week four the litter was soaked, feed intake dropped, and he called us because the birds were "not growing". At week five a humid afternoon with no wind killed 46 birds in three hours. He sold 200 of the biggest birds early to a trader at a poor price to relieve the house, and the remainder finished at 1.9 kg at 47 days. The next batch, in the same house, he stocked 450 chicks, added four more drinkers, and cut the front mesh higher for airflow. Mortality was 3%, average weight 2.5 kg at 42 days, and although he sold fewer birds his feed bill was two-thirds of the first batch and his profit was higher. He now describes the house as a 450-bird house, which is what it always was.

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