Broilers must undergo a well-managed and trustable feed withdrawal programme prior to be slaughtered, thus reducing the risk of contamination during the evisceration and minimising the chances of economic penalties inflicted by the salvaging of contaminated carcasses. The best results at plant are achievable when birds remain between 8h and 12h off feed prior to hanging. Along this period of time birds experience an inherent live weight shrinkage, which, depending upon the environmental conditions may well vary between 0.35% and 0.50% per hour off feed. Therefore, the greatest challenge of the feed withdrawal programme is properly balancing the cleanliness of the gastrointestinal tract of the birds and the weight shrinkage, protecting the product's safety and the company's bottom line.