Levels of pain endured by the average hen in different production systems

Estimates of the number of days that the average egg-laying hen will spend in pain over her lifetime. A 'day' is considered to be 16 hours, the length of time that theaverage hen is awake.

Source: Welfare Footprint based on Schuck-Paim and Alonso (2021)

Note: The researchers quantify time in pain in terms of hours, where only waking hours – 16 per day – are considered. This has been converted to days by diving by 16.