1. Ilan Branch, Livestock Research Institute, Council of Agriculture, Executive Yuan, Taiwan
2. Institute of Animal Science, University of Halle (Saale), Halle (Saale), Germany
3. INRA, UE89 Palmipèdes à Foie Gras, Domaine d'Artiguères, F-40280 Benquet, France and UMR1289 Tissus Animaux Nutrition Digestion Ecosystème et Métabolisme, F-31326 Castanet-Tolosan, France
4. Wrocław University of Environmental and Life Sciences, Institute of Animal Breeding, Division of Poultry Breeding, Wrocław, Poland
5. INRA, UR83 Recherches Avicoles, F-37380 Nouzilly, France
6. Changhua Animal Propagation Station, Livestock Research Institute, Council of Agriculture, Executive Yuan, Taiwan