Observations on a heard of beef cattle maintained in a tsetse area

Abstract
Three groups of Boran cattle were maintained under different trypanocidal drug regimes for 29 months in an area of “medium” tsetse challenge. The development of immunity to trypanosomiasis in the cattle was assessed on the basis of changes in trypanocidal drug requirement, development of parasitaemia, ability to maintain normal blood values, growth and response to challenge after the withdrawal of the drugs. Observations were also made on serum antibody content by immunofluorescence and on serum immunoglobulin levels.