Slaughterhouse design significantly affects animal welfare during the final hours of life, with evidence-based design principles reducing fear and pain during handling and stunning.
Slaughterhouse design welfare reflects the application of animal behaviour science to the management of fear in the most welfare-critical environment of a farm animal's life. Temple Grandin's pioneering work demonstrating that cattle behave differently in curved versus straight races - naturally following curves without the panic response that straight-line races trigger - transformed the design of US feedlots and abattoirs and influenced practice internationally. The principles underlying good abattoir design are animal behavioural: cattle move more calmly when they cannot see handlers in front of them, when lighting does not create high-contrast shadows that appear as holes, when handling is consistent and quiet, and when races follow natural movement patterns. The welfare benefit of well-designed handling systems is measurable in reduced fear vocalisations, reduced balking and back-up, and lower cortisol at stun box entry. However, design is only effective when combined with appropriate staffing, training, and throughput management: even excellently designed facilities can have poor welfare outcomes when throughput pressure causes workers to rush, use prods excessively, or neglect the careful observation that identifies animals requiring additional handling time.