Overwintering sheep indoors raises welfare questions about space allowance, ventilation, and social management that affect flock health and welfare.
Winter housing welfare for sheep depends on the quality of the housing system provided. Adequate space allowance prevents the chronic stress and injury associated with overcrowding; good ventilation prevents the accumulation of ammonia and pathogens that cause respiratory disease. Sheep are social animals with established hierarchies — mixing unfamiliar animals in housing increases aggression and stress. The welfare implications of poor winter housing compound over the 12-20 weeks animals may be housed, and management decisions made at housing — vaccination, foot treatment, group management — affect welfare outcomes throughout the housed period.