Summer is the most nerve-wracking season for broiler producers worldwide. Every year, mature flocks suffer from severe heat stress. Because modern broilers grow so rapidly, they generate massive amounts of metabolic heat but possess no sweat glands, relying entirely on panting to stay cool.
When ambient temperatures climb above 30°C, combined with high humidity, a flock’s mortality rate can spike catastrophically within hours. This definitive guide covers how to design and manage a high-efficiency evaporative cooling pad system and tunnel ventilation setup to keep your birds safe and productive during severe heatwaves.
The Biological Reality of Heat Stress
To manage heat stress effectively, farmers must understand how broilers interact with their environment. Broilers release heat through radiation, conduction, and convection. However, once the air temperature matches their body temperature, these methods fail. The bird’s last line of defense is evaporative cooling via panting.
Panting requires significant physical effort. If the air is not moving or is already saturated with moisture, panting becomes ineffective, leading to rapid heat exhaustion, respiratory alkalosis, and organ failure.
The Solution: Tunnel Ventilation + Evaporative Cooling Pads
The most effective weapon against extreme summer heat is the combination of Tunnel Ventilation and Evaporative Cooling Pads. Cooling pads are installed at one end of the poultry house, and water is continuously pumped to run down them. Massive tunnel fans at the opposite end pull hot outside air through these wet pads. As the dry, hot air passes through the moist cellulose media, the water evaporates, absorbing thermal energy from the air and lowering the temperature significantly.
The cooled air is then pulled across the house at high velocity. This high-speed airflow creates a powerful wind-chill effect on the birds’ skin, stripping away their boundary layer of heat and making them feel much cooler than the actual ambient temperature. Protect your livestock from extreme summer heatwaves with our heavy-duty Poultry Ventilation Systems.
Mastering the Critical Relationship Between Humidity and Temperature
A common trap is the over-reliance on cooling pads when the outdoor humidity is already extremely high. Evaporative cooling relies entirely on the air’s ability to absorb moisture. If the outdoor Relative Humidity (RH) is 80%, the air can barely hold any more water, meaning your cooling pads will provide very little temperature drop while dangerously raising the internal humidity.
If the house becomes humid and hot, you must turn off the water pumps to the cooling pads and maximize air velocity via your tunnel fans alone to cool the birds via convection. Monitor your temperature and humidity thresholds automatically with our precision digital Poultry House Controllers and Automation.
Keeping Water and Feed Lines Operational During Heat Stress
During a heatwave, your feeding and drinking infrastructure must support your cooling efforts:
- Keep Water Cool: Hot birds will refuse to drink warm water. Ensure your drinking lines are flushed regularly with cool water. Keep your birds well-hydrated with fresh, cool water by upgrading to our automated Poultry Drinking Systems.
- Adjust Feeding Schedules: Avoid feeding birds during the hottest hours of the day. Digesting feed creates internal metabolic heat, which can overload a bird’s system during a heatwave.
Using automated winches to lift feeding lines during peak heat hours prevents birds from crowding the pans and generating extra group heat. Optimize your pan systems with our robust Poultry Feeding Systems. Secure all your summer upgrades through our centralized Poultry Equipment Store.
Cooling System Maintenance: Pre-Summer Checklist
Do not wait for the first heatwave to test your cooling infrastructure. De-scale your cooling pads using approved agents to restore airflow. Inspect your submersible pumps to ensure water distribution is uniform across the cellulose media, and tighten all fan belts on your tunnel fans to prevent slippage and drop in air velocity.
Conclusion: Dominate the Summer with Roxon Equipment
Heat stress is a manageable challenge if you have the right equipment and understand the underlying science of evaporation and air velocity. By pairing durable cellulose cooling pads with high-velocity tunnel fans and a smart controller, you can maintain consistent growth rates and low mortality all summer long.