1. Animal Breeding and Genetics Group, Department of Animal Sciences, Egerton University, PO Box 536, 20115 Egerton, Kenya
2. Ministry of Livestock Development, Livestock Recording Centre, PO Box 257, 20117 Naivasha, Kenya
3. Institute of Animal Breeding in the Tropics and Sub-Tropics, Humboldt University of Berlin, Philippstraβe 13, 10115 Berlin, Germany
4. National Beef Research Centre, Kenya Agricultural Research Institute, PO Box 3840, 20100 Nakuru, Kenya