1. Australian Cooperative Research Centre for Beef Genetic Technologies, University of New England, Armidale, NSW 2351, Australia
2. NSW Department of Primary Industries, Beef Industry Centre, University of New England, Armidale, NSW 2351, Australia
3. Department of Agriculture and Food, Western Australia, South Perth, WA 6151, Australia
4. Department of Meat Science, University of New England, Armidale, NSW 2351, Australia
5. Marrinya Agricultural Enterprises, 70 Vigilantis Road, Wuk Wuk, Vic. 3875, Australia
6. School of Veterinary and Biomedical Science, Murdoch University, Murdoch, WA 6150, Australia