1. School of Agriculture, Policy and Development; Univ. of Reading; PO Box 236 Reading RG6 6AT UK
2. Agroscope-Posieux; CP 64 1725 Posieux Switzerland
3. INRA; UMR 1225 IHAP, BP 87614 Toulouse 31076 France
4. Dep. of Chemistry; Univ. of Turku; 20014 Turku Finland
5. Molecular Plant Breeding; ETH Zürich; 8092 Zürich Switzerland
6. Forage Production and Grassland Systems; Agroscope; 8046 Zürich Switzerland
7. INRA UMR1213 Herbivores; 63122 St-Genès-Champanelle France
8. Wageningen Univ. and Research; Animal Nutrition Group; PO Box 338 6700 AH Wageningen The Netherlands
9. IBERS; Aberystwyth SY23 3EB UK
10. NIAB; Huntingdon Rd. Cambridge CB3 0LE UK
11. Dep. of Veterinary Disease Biology; Univ. of Copenhagen; Dyrlaegevej 100 Frederiksberg C 1870 Denmark
12. Cotswold Seeds; London Rd. Moreton-in-Marsh GL56 0JQ UK
13. Molecular Ecology; Agroscope; 8046 Zürich Switzerland
14. Institute of Veterinary and Biomedical Sciences; Massey Univ.; Private Bag 11222 Palmerston North 4474 New Zealand