16/04/2026
High humidity = silent calf killer ❌
Some farms focus only on temperature, whilst humidity is contributing significantly to disease, poor growth, and inefficiency in calf buildings.
If your shed feels damp and cold, smells stale or strong, or calves are constantly dirty, humidity could be your biggest issue.
What high humidity is doing:
• Increasing survival of bacteria, viruses, and parasites
• Raising pneumonia risk through poor air quality
• Making calves colder, even at moderate temperatures
• Reducing bedding quality and hygiene
Key warning signs:
• Condensation on walls or roof
• Wet, heavy bedding
• Lingering ammonia smell
• Calves coughing and/or sweating
How to fix it:
1) Ventilation
Fresh air in, stale air out.
You cannot bed your way out of poor airflow.
2) Dry bedding
Kneel test: if your knees get wet, your drainage is not good enough and your nesting score needs to be higher.
3) Stocking density
Too many calves increases moisture load and airborne pathogens.
4) Water management and drainage
Fix leaks and reduce standing liquid around automatic feeders and water troughs.
Target humidity: Below 70%.
If you’re not sure whether humidity is an issue, you can check using a Hygometer 🌡️
If you want help assessing whether your calf building is hindering performance, send me a message or comment “AIR” 👇🏻