s:959:"%T Measuring the costs of African animal trypanosomosis, the potential benefits of control and returns to research 
%A Kristjanson, P. 
%A Swallow, B. 
%A Rowlands, G. 
%A Kruska, R. 
%A de Leeuw, P. 
%X This paper addresses issues surrounding measurement of the potential productivity gains from new livestock tech- nologies and the returns to international livestock research. The approach, applicable to many livestock production constraints and technologies, uses geographic information systems (GIS) to spatially link a biophysical herd simulation model with an economic surplus model. The particular problem examined is trypanosomosis in cattle in Africa, and the potential research product is a multi-component vaccine. The results indicate that the potential benefits of improved trypanosomosis control, in terms of meat and milk productivity alone, are $288 million, with an internal rate of return of 33%, and a benefit/cost ratio of 34:1 . 
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