Calf housing design and management profoundly affects welfare from birth to weaning in dairy systems, with significant variation in current practice.
Calf housing welfare involves trade-offs between disease control and social needs. Individual pen housing prevents disease spread but deprives calves of positive social interaction, play behaviour, and comfort suckling that are natural motivations. Research consistently shows that paired and small-group housing from early ages improves welfare indicators and cognitive performance without increasing disease risk when management is good. Providing enrichment including brushes, play objects, and access to view adjacent calves substantially improves welfare in individually housed calves. Bedding quality, ventilation, and space allowance are baseline welfare requirements that vary widely across current UK practice.