1. International Livestock Research Institute (ILRI), Nairobi, Kenya
2. Institut fuer Pflanzenbau und Gruenland, Universitaet Hohenheim, Stuttgart, Germany
3. Species Survival Commission (SSC), The World Conservation Union (IUCN), c/o South African National Biodiversity Institute, Centre for Biodiversity Conservation, Cape Town, Republic of South Africa
4. University of Groningen, 30 Kerklaan, AA Haren, The Netherlands