1. Swedish University of Agricultural Sciences, Uppsala, Sweden (retired)
2. AFRC Institute for Grassland and Animal Production, Edinburgh, United Kingdom (retired)
3. Institute of Agricultural and Nutritional Sciences, Martin Luther University, Halle-Wittenberg, Germany (retired)
4. INRA Station de Recherches Avicoles, Nouzilly, France (retired)
5. Lohmann Tierzucht GmbH, Cuxhaven, Germany (retired)
6. Roslin Institute, Edinburgh, United Kingdom (retired)