In this Dean’s Research Seminar, Professor Frank Dunshea discusses the challenge of heat stress in livestock in a changing climate, and how a range of options to mitigate it through feeds and additives. Modern livestock have a high rate of metabolism and consequently are susceptible to heat stress. Our changing climate is likely to result in an increase in the severity, frequency and duration of heat waves. Efforts by the animal to dissipate excess body heat come at a cost to health and divert energy away from growth, compromising efficient animal production.