1Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Wales SY23 3EB, UK.
2Cooperative Research Centre for Beef Genetic Technologies and Industry & Investment NSW, University of New England, Armidale, NSW 2351, Australia.
3Estaciön Experimental del Zaidín, CSIC, Profesor Albareda 1, 18008, Granada, Spain
4Agricultural Research Centre of Finland, Animal Production Research, Kirkkotie, Jokioinen FIN-31600, Finland.
5Rowett Institute of Food and Health, Aberdeen University, Scotland, UK.
6INRA, UR 1213, Unité de Recherches sur les Herbivores (URH), Theix, F-63122 Saint-Genès Champanelle, France