Winter housing of sheep protects them from harsh weather but creates welfare challenges from overcrowding, respiratory disease and increased parasite transmission in housed systems.
Winter housing protects sheep from hypothermia, flooding and the energy costs of cold weather while allowing closer monitoring during the critical lambing period. However, housing creates its own welfare challenges. Respiratory disease spreads rapidly in poorly ventilated buildings. Parasites accumulate in housing. Lameness from wet floors and footrot increases. Social hierarchies in overcrowded conditions prevent subordinate sheep from accessing feed and rest. Good housing welfare requires adequate space, excellent ventilation, appropriate bedding, and management of the stocking density and feed access that determines whether the welfare benefits of housing outweigh the costs.