Sheep kept indoors during winter require good ventilation, adequate bedding, and appropriate stocking density to maintain welfare during the housing period.
Winter housing of sheep concentrates animals in enclosed spaces where airborne pathogens, ammonia, and social competition all increase. Good ventilation is the single most important factor in housed sheep welfare: it reduces respiratory disease risk dramatically. Adequate stocking density allows normal lying and social behaviour without chronic competition for space. The nutrition of housed ewes in late pregnancy directly affects lamb welfare through birthweight and neonatal immunity. Farmers who invest in appropriate housing infrastructure and management reduce welfare problems and improve productivity simultaneously.