Turkey Heat Stress: Welfare Management in Commercial Production

Key Facts

• Turkeys cannot sweat and rely on panting and wing-spreading for thermoregulation
• Heat stress above 30C causes panting, reduced feed intake, laying down, and acute mortality
• Heavy commercial strains bred for rapid muscle growth have reduced heat tolerance compared to heritage breeds
• Wet bulb temperature (humidity combined with temperature) is a better predictor of heat stress than temperature alone
• Cooling strategies including tunnel ventilation, misters, and cool water provision are the primary interventions

Welfare Considerations

Turkey heat stress causes significant acute and chronic welfare impacts. Acute heat stress events cause visible distress — panting with mouth open, wing-drooping, seeking cool areas, and in severe cases convulsions and death. Chronic mild heat stress causes sustained appetite suppression, reduced growth, and immune suppression that predisposes to disease. High-density commercial housing amplifies heat load. Welfare monitoring during heat events should be continuous — rapid mortality spikes indicate thermal welfare emergencies requiring immediate intervention. Providing cool drinking water, shade, and ventilation are minimum welfare requirements.

What You Can Do

• Implement tunnel ventilation in turkey houses as a minimum for summer welfare management
• Ensure cool, clean water access is maximized during heat periods — water intake doubles in heat
• Install misters or evaporative coolers in high-temperature regions as a standard welfare measure
• Monitor birds continuously during hot weather and have emergency protocols for acute heat events
• Consider stocking density reduction as a heat management tool — lower density reduces thermal load