1. Institute of Animal Science; University of Hohenheim; Garbenstraße 17 70599 Stuttgart Germany
2. Institute of Animal Breeding and Husbandry; Christian-Albrechts-University Kiel; Hermann-Rodewald-Straße 6 24118 Kiel Germany
3. Functional Breeding Group; Department of Animal Science; Georg-August-University Göttingen; Burckhardtweg 2 37077 Göttingen Germany