1. Institute of Farm Animal Genetics; Friedrich-Loeffler-Institut; 31535 Neustadt-Mariensee Germany
2. Animal Breeding and Genetics Group; Department of Animal Sciences; Georg-August-Universität Göttingen; 37075 Göttingen Germany
3. Sokoine University of Agriculture; PO Box 3000 Morogoro Tanzania
4. School of Biological Sciences; University of Dodoma; PO Box 259 Dodoma Tanzania
5. Animal Evaluations Unit; CRV; PO Box 454, 6800 AL Arnhem The Netherlands