Affiliation: Animal Genetics and Breeding Unit, University of New England, Armidale, NSW, 2351 Australia; Department of Agricultural Sciences, Karatina University, PO Box 1957-10101, Karatina, Kenya.
Affiliation: Animal Breeding and Husbandry in the Tropics and Subtropics, University of Hohenheim, Garbenstrasse 17, 70599 Stuttgart, Germany; Livestock Genetics, International Livestock Research Institute, Box 30709-00100 Nairobi, Kenya.
