Microclimate THI Calculator
Calculate Temperature-Humidity Index (THI) to assess heat stress risks and map automated cooling responses.
Utility & Scientific Formula
Heat stress is a multi-billion dollar challenge that blocks natural heat dissipation in livestock. The dry-bulb temperature alone is insufficient; humidity significantly amplifies stress. This tool uses the standard meteorological THI equation utilized in dairy and poultry sciences:
THI = (1.8 * Td + 32) - (0.55 - 0.0055 * RH) * ((1.8 * Td + 32) - 58)
Where Td is dry-bulb temperature (°C) and RH is relative humidity (%). Clinical thresholds differ by species:
- Dairy Cow: Comfort zone is THI < 68. Over 68 triggers milk yield drop (1.5 kg/day). Over 72 triggers severe panting, and over 80 represents life-threatening hyperthermia.
- Poultry: Comfort depends on age, but adult broilers suffer acute stress when ambient temperatures exceed 25°C at high relative humidity. Misting and high velocity wind tunnels are required to lower sensible heat.
🌡️ Environmental Stress Evaluation
Enter local dry-bulb temperature and humidity readings to run stress assessments.
Milk yield expected to drop 1.5 - 3 kg/day. Respiration exceeds 80 breaths/min.
- Activate soakers/sprinklers at feed barriers (5 min on, 10 min off cycle).
- Engage variable-frequency fans at 100% capacity.
- Deploy activity tags to monitor rumination time drops.