The objective of the study was to determine the roasting induced changes in texture, muscle fibre microstructure, and cooking losses for the bovine m. semitendinosus (ST) muscle. The muscle slices were roasted at 1700C until they reached the internal temperatures of 50, 60, 70, 80, 90 and 95⁰C. The texture profile analysis of the samples was carried out using a texture analyser. The changes in microstructure were evaluated by scanning electron microscopy and by measuring the length of sarcomeres and diameter of muscle fibres. The cooking losses were evaluated by difference between the sample masses before and after roasting. Roasting was found to have a significant effect on the analysed texture parameters. The values for hardness and chewiness increased with internal temperature of the meat, whereas those for springiness, cohesiveness and resilience decreased above the temperature of the muscle collagen shrinkage. The length of sarcomeres did not change up to the meat internal temperature of 500C and then decreased with temperature. The fibre diameter decreased in meat roasted to 60⁰C and remained stable after heating to the higher internal temperatures. The cooking losses increased with temperature. The largest increases in the losses occurred in the range of 50 and 60 to 70^oC.