The objective of this study was to examine the effects of rearing temperature on the meat yield of broilers. Four experiments were conducted. Experiment 1 examined meat yield at different temperatures and on different diets when birds were grown to a fixed age. Experiments 2 and 3 were aimed at the effects of temperature and of the interaction between temperature and stocking density respectively on the meat yield of broilers when killed at a specified liveweight (i.e. allowing the rearing period to vary). Experiment 4 was designed to assess whether depression of growth rate at high temperature affected the meat yield in broilers.