Ventilation system failures in intensive poultry houses can kill thousands of birds within hours, representing catastrophic welfare risk from infrastructure dependency.
Ventilation-dependent intensive poultry production creates a welfare risk that is inherent to the system design: animals kept at stocking densities that require mechanical ventilation to maintain survivable conditions are vulnerable to catastrophic welfare failure whenever that ventilation fails. This dependency on infrastructure creates a welfare risk that has no equivalent in extensive or lower-density systems. The most common cause of welfare failure is power outage combined with inadequate backup generation, a risk that increases in frequency and severity with climate change increasing extreme weather events. Regulatory requirements for backup power and monitoring systems address the risk partially, but compliance is uneven and the fundamental vulnerability remains as long as animals are stocked at densities requiring mechanical ventilation for survival.