1. Department of Animal Breeding and Genetics, Justus-Liebig-University, Ludwigstr. 21B, D–35390 Giessen, Germany
2. 2Central Biotechnical Unit, Strahlenzentrum of the Justus–Liebig–University, Leihgesterner Weg 217,D–35392 Giessen, Germany
3. Department of Molecular Animal Breeding and Biotechnology, Ludwig–Maximilians University Munich, Hackerstraße 27, D–85764 Oberschleißheim, Germany
4. Division of Evolutionary Molecular Systematics, Department of Genetics, University of Lund, Sölvegatan 29, S–22362 Lund, Sweden