Characterisation of trypanotolerant cattle: a case study

Emphasises the importance of trypanotolerance by indicating that trypanotolerant breeds were at least as productive as other indigenous African breeds in areas of zero to low tsetse challenge and that in areas where tsetse challenge was substantial, only trypanotolerant breeds could survive. It was known that as tsetse challenge increased, the resistance of trypanotolerant livestock to trypanosome infection diminished, resulting in stunting, wasting, abortion and death. Similarly, stress factors, such as, over work, pregnancy, parturition, lactation, poor nutrition and intercurrent disease had been identified as affecting the susceptibility of trypanotolerant animals to infection. It was aparent that more precise research information would have to be obtained in order to achieve a better understanding of genetic resistance, acquired resistance, environmental factors that affect susceptibility and efficacy of control measures available, and to ensure optimal application of research findings.