1. Department of Animal Breeding and Husbandry in the Tropics and Sub-tropics, University of Hohenheim, Garben str. 17, 70599 Stuttgart, Germany.
2. Livestock Efficiency Enhancement group (LEEG), Department of Animal and Fisheries Sciences, Maseno University, P.O. private bag 40105 Maseno, Kenya.
3. Kenya Agricultural and Livestock Research Organization, P.O. Box 25, 20117, Naivasha, Kenya.
4. Departmentof Animal Breeding and Genetics, University of Hohenheim, Garben str. 17, 70599 Stuttgart, Germany.