Power failures in mechanically ventilated poultry housing can cause catastrophic mass mortality within hours during hot weather, representing one of the most acute welfare emergencies in intensive agriculture.
Ventilation failure mortality in poultry represents some of the most acute and preventable mass animal welfare emergencies. Thousands to hundreds of thousands of birds dying from heat stress in a single incident over a matter of hours is a catastrophic welfare event. The suffering during heat death — panting, prostration, cardiac failure, loss of consciousness — is severe. The tragedy is that the technical solutions are well understood: backup generators, alarm systems, and natural ventilation backup can prevent or dramatically reduce mortality. The barrier is cost and the absence of mandatory requirements in many jurisdictions. The welfare case for mandatory backup ventilation requirements is straightforward: the welfare cost of non-compliance is catastrophic when the system fails, and the economic case for backup systems is also strong given the livestock mortality costs of failure.