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education and assignments, focusing particularly, but not exclusively, on developing countries and countries with economies in transition. Besides Noragric’s role as the international gateway for UMB, Noragric also acts on behalf of the Norwegian College of Veterinary Medicine (NVH) and of Norwegian Agricultural Research International (NARI), which form alliances with UMB. Noragric Working Papers present research outcome, reviews and literature studies. They are intended to serve as a medium for Noragric staff and guest researchers to receive comments and suggestions for improving research papers, and to circulate preliminary information and research reports that have not yet reached formal publication. The findings in this Working Paper do not necessarily reflect the views of Noragric. Extracts from this publication may only be reproduced after prior consultation with the author and on condition that the source is indicated. For rights of reproduction or translation contact Noragric. The study leading to this Working Paper was funded by the US Agency for International Development (USAID) and the results will be published in a forthcoming USAID publication