The first sign is usually a sound, not a sight: a sneeze in the corner of the house or a rattle when the flock settles at dusk.
Halaal Farms Ghana team13 August 2026 · 11 min read
The first sign is usually a sound, not a sight. A sneeze from the corner of the house is easy to dismiss. A few days later a rattle comes from the same corner at dusk, and then two hens look puffy around the eyes. By that point the disease has usually been moving through the flock for some time.
Chronic respiratory disease, or CRD, is one of the most common reasons a keeper ends up with a long, slow problem instead of a short, sharp one. This guide covers how it spreads, how to recognise it, what you can change on the farm, and how to work with your vet. It does not give treatment doses. Those decisions belong to a vet who can see your birds.
In most flocks, CRD is driven mainly by a bacterium called Mycoplasma gallisepticum. Other bacteria, E. coli among them, often move in after it, taking advantage of the damage it does to the airways. It is called chronic because the infection can smoulder for weeks, quieten down and then flare again when the birds are under stress. Many birds carry it with very little to show, which is why a flock can look fine until something pushes it over the edge.
Spread is the part that frustrates keepers most. The organism moves between birds through the air and on dust, and it travels on people, equipment and vehicles. It can also pass through hatching eggs, which is one reason breeding flocks matter so much. Ask any hatchery, us included, what health history stands behind a breeding flock. A clean start is far easier to keep than a sick flock is to clear.
The bacteria are only part of the story. A house that is damp, dusty or badly ventilated gives the airways no chance to recover between exposures. That is why two keepers with the same source of birds can end up with very different results.
The usual signs are respiratory. Look for:
These signs can also come from dust, ammonia and draughts, so a sick bird is not automatically a CRD case. That is why a diagnosis matters, and why you should describe the signs to your vet in detail rather than sending a single word.
One warning needs to be clear. Respiratory signs also show up with Newcastle disease and avian influenza. Both are serious, and both must be reported to the veterinary services. If birds are dying quickly, the problem is spreading fast, or you see blue, swollen or very dark combs, do not assume it is CRD. Call your vet at once, keep visitors out of the house and keep the sick birds apart from the rest while you wait.
CRD is a disease that the house creates as much as the germ does. Several things commonly push a flock over the edge:
Each of these is something you can see and change. None of them needs a drug to fix. That is the good news in this guide, and it is the reason the everyday controls matter more than any single treatment.
Most of what you can do about CRD is plain and daily. Good airflow comes first. You want fresh air moving through the house at bird height without a draught blowing straight across the flock. Adjust curtains and vents with the weather, and check the house in the morning and again in the evening, not just once a week.
Litter comes next. Wet litter gives off ammonia, and ammonia damages the lining of the airways. If you can smell the house before you see the birds, the litter needs work. Remove wet patches, clear droppings regularly and fix any drinker that leaks. A dry, loose litter surface is the goal, although how you get there depends on the house and the season.
Dust is harder to beat in a dry spell. Avoid sweeping while birds are in the house, because a broom throws up exactly the fine material that irritates the lungs. Dampen the walkway lightly before you work, and keep feed spills swept up, since a pile of spilled meal in a corner goes dusty and mouldy fast.
| Factor | What you notice | What to change |
|---|---|---|
| Ammonia | Sharp smell at bird height, watery eyes | Dry the litter, improve airflow, clear droppings more often |
| Dust | Fine layer on feeders, sneezing at feeding time | Sweep less while birds are in, dampen the walkway, keep spills off the floor |
| Draughts | Birds huddled on one side, chilled birds at the edges | Adjust curtains and vents so air passes above the flock, not across it |
| Crowding | Packed sides of the house, uneven growth | Check stocking against the real floor space you have |
| Stress events | Signs appearing after a move, a feed change or a weather swing | Plan moves for calm days and avoid changing feed in the same week |
| Poor hygiene | Sickness returning after every batch | Clean, disinfect and rest the house properly between batches |
The strongest control on a long-running respiratory problem is an empty, clean house between batches. Remove all litter and dust, wash the house, let it dry fully, and disinfect according to the label. Then rest it for long enough that the organisms left in the building have time to die off. The right rest period is one to agree with your vet and fit into your farm plan. It is not a number to copy from a forum.
Keep one age group together and empty the whole house at once where you can. This is the practice usually called all-in, all-out. It stops older birds passing infection to younger ones in the same building, and it gives you a clean slate to work from. Do not rush birds from house to house, and do not carry equipment from a sick house into a clean one without washing it first.
There is no do-it-yourself fix for CRD. Your vet can confirm the diagnosis, sometimes with laboratory tests, and advise whether treatment makes sense for your flock, given the age of the birds and what you want from them. Treatment can ease the signs and reduce losses, but in many flocks the infection does not disappear completely.
Two rules matter here. First, do not buy medicine off a shelf and start mixing it into the water on a guess. The wrong product, the wrong timing or poor water intake can make things worse. Second, respect the withdrawal period. Every medicine has a time after the last dose before eggs or birds are safe to sell or eat. Ask your vet to write the dates on your record sheet, and keep that sheet with the house book.
Vaccination is a conversation too. The vaccines in our batches cover five diseases, and we tell you what was given so your records are right from the start. Respiratory bacteria such as Mycoplasma are a separate question. Whether a Mycoplasma-specific programme suits your flock is a decision for your vet, based on your birds and your history.
When signs flare, the goal is to cut stress and stop the spread between houses while your vet does the diagnostic work. A few habits help a great deal:
Keep the notes in the same book as your visitor record and your medicine dates. When everything sits in one place, the vet can see the whole picture in a single visit.
A vet can often ease the signs and bring losses down. In many flocks the infection stays in a low, quiet form afterwards. Ask your vet what success looks like for your flock before you start, so that your expectations and the treatment plan match.
That is a decision for your vet, based on the diagnosis, the age of the birds and the value of the flock. Chronic cases should be reviewed together with the vet rather than decided on a guess.
Not until the withdrawal period of the medicine has passed. Check the label and the dates your vet gives you, and keep a written record of both.
It can, particularly through breeding flocks, through dust, and through a house that is not cleaned and rested between batches. A clean, empty house and a clear record help break the cycle.
Some signs overlap, but they are not the same disease, and avian influenza is reportable. Sudden deaths, fast spread, or swollen or very dark combs need urgent vet attention rather than a wait-and-see approach.
The best time to tackle CRD is before the next batch arrives, when the house is empty and clean. Plan your ventilation, litter and water now, and ask your vet which health records to keep for the new flock. Our guide on humidity and draughts in the brooder is worth reading too, because the habits you build in the first weeks carry into the laying house. When you are ready, send the order form on our order page or call 024 915 1503 to plan your hatch date. We confirm the price, hatch date and delivery cost before any money changes hands.
Written by the Halaal Farms Ghana team. We hatch and import day-old chicks at Opeikuma, Kasoa, and deliver to all 16 regions. This article is general guidance for farmers. For diagnosis and treatment of sick birds, speak to a vet or your district veterinary office.
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