1. Wageningen University & Research Animal Breeding and Genomics, P.O. Box 338, 6700 AH Wageningen, the Netherlands.
2. Topigs Norsvin Research Center, Schoenaker 6, 6641 SZ Beuningen, the Netherlands.
3. Hendrix Genetics, P.O. Box 114, 5830 AC Boxmeer, the Netherlands.
4. University of Guelph, Centre for Genetic Improvement of Livestock, 50 Stone Rd E, N1G 2W1, Guelph, ON, Canada.