1. Department of Animal Sciences, University of Illinois at Urbana-Champaign, 1201 W. Gregory Dr., Urbana, IL 61801, USA 2. Department of Animal Science, Purdue University, West Lafayette, Indiana 47907-1151, USA 3. Animal Breeding and Genetics Group, Wageningen University, PO Box 9101, Wageningen, 6701 BH, The Netherlands 4. Institute for Genomic Biology, University of Illinois at Urbana-Champ...