How does air chilling differ from water chilling for poultry carcasses?

In poultry processing, carcasses are chilled to below 4 °C (40 °F) using either water or air. These methods differ significantly in their mechanics, efficiency, and impact on the final product:1

• Water Chilling: Common in North America, this method uses a countercurrent flow of cold water and large tanks. It is water-intensive but helps minimize bacterial cross-contamination by diluting pathogens. Because the meat absorbs water, weight gain is strictly regulated by law.2
• Air Chilling: The standard in Europe, this process involves hanging carcasses in coolers with rapidly moving air. While it prevents cross-contamination between birds, it can lead to dehydration and weight loss. It is less energy-efficient than water chilling.3

Regarding food safety, water chilling may result in a lower overall bacterial load because pathogens are washed away, whereas air chilling keeps any existing pathogens on the individual bird. Final chilling for air-chilled birds typically reaches temperatures just above the freezing point.3