1. Topigs Norsvin, Topigs Norsvin Research Center, Schoenaker 6, 6641 SZ, Beuningen, the Netherlands.
2. Topigs Norsvin USA, 12750 Nicollet Ave. S. Suite 300, 55337, Burnsville, USA.
3. Pipestone Applied Research, 1300 S. Hwy 75, 56164, Pipestone, USA.