Aspergillosis is one of the most underestimated killers in poultry farming. It doesn’t spread bird-to-bird like a virus, yet it can wipe out chicks quickly—especially in hatcheries and brooders. Understanding where it comes from, how it enters your system, and how to stop it is critical for protecting flock performance and hatchability.

What Is Aspergillosis?

Aspergillosis is a fungal respiratory disease caused mainly by Aspergillus fumigatus. The fungus produces microscopic spores that birds inhale, not ingest. Once inside the lungs or air sacs, the spores grow and form fungal plaques, reducing oxygen exchange.

Young chicks are extremely vulnerable because:

Their immune system is immature
Their lungs and air sacs are still developing
They breathe faster than adult birds

Common Signs in Chicks and Growers

In Chicks (Most Severe)

Sudden deaths with little warning
Gasping or open-mouth breathing
Weak, lethargic chicks that fall behind
Poor hatch-out or high first-week mortality

In Older Birds

Laboured breathing
Reduced feed intake
Poor growth and feed conversion
Chronic respiratory distress

⚠️ Antibiotics do not work—this is a fungal disease.

Where Does Aspergillus Come From?

Aspergillus spores are everywhere in the environment, but disease only occurs when birds are exposed to high spore loads.

Main Sources on Poultry Farms

1. Moldy Litter or Bedding

Wet wood shavings
Old litter reused without proper drying
Straw or sawdust stored in damp conditions

2. Contaminated Hatchery Environment

Dirty setters and hatchers
Poor air filtration
High humidity with organic dust
Mold growing on walls, ceilings, or fans

3. Moldy Feed or Ingredients

Feed stored in warm, humid conditions
Spoiled grain or cracked maize
Condensation inside feed bins

4. Poor Ventilation

High ammonia damages respiratory lining
Stagnant air allows spores to accumulate

Why Hatcheries Are High-Risk Zones

Hatcheries create the perfect storm for Aspergillus:

Warm temperatures
High humidity
Organic dust from eggs and fluff

If one hatcher becomes contaminated, thousands of chicks can be exposed within hours.

Preventing Aspergillosis (The Most Important Part)

1. Litter and Bedding Control

Use dry, fresh litter only
Never use musty or clumped shavings
Store bedding off the floor and under cover
Discard any litter with visible mold

2. Hatchery Hygiene (Non-Negotiable)

Wash and disinfect setters and hatchers after every cycle
Use fungicidal disinfectants, not just bacterial ones
Clean fans, vents, and ducting
Keep humidity controlled—avoid condensation

3. Ventilation Management

Ensure constant air exchange
Remove ammonia buildup
Avoid dead air zones in brooders and hatchers

4. Feed Management

Buy feed from reputable suppliers
Store feed in cool, dry conditions
Empty and clean feed bins regularly
Never feed moldy or caked feed

What to Do If You Suspect Aspergillosis

Immediate Actions

Remove affected birds (they won’t recover well)
Improve ventilation immediately
Remove and replace all suspect litter
Clean and disinfect the environment thoroughly

Can Birds Recover?

Chicks: Recovery is poor once lungs are damaged
Older birds: Mild cases may stabilize if exposure stops

There is no effective treatment once fungal plaques are established. Prevention and early intervention are the only real solutions.

Disinfection Tips That Actually Work

Use disinfectants labeled effective against fungi
Fogging works better than spraying for air systems
Heat + drying after cleaning kills spores
Avoid organic matter before disinfection—clean first

Key Takeaways for Poultry Farmers

✔ Aspergillosis is an environmental disease, not contagious
✔ Moisture + organic matter = danger
✔ Hatcheries are the highest-risk area
✔ Prevention costs far less than chick losses
✔ Clean, dry, well-ventilated systems save birds