1. Animal Breeding and Genomics Centre, Wageningen University, PO Box 338, 6700 AH, Wageningen, The Netherlands
2. School of Veterinary and Life Sciences, Murdoch University, 90 South Street, Murdoch, WA, 6150 Australia
3. CRC for Sheep Industry Innovation, University of New England, Armidale, NSW 2351 Australia
4. School of Environmental and Rural Science, University of New England, Armidale, NSW, 2351, Australia
5. Department of Agriculture and Food Western Australia, 3 Baron-Hay Court, South Perth, WA, 6151, Australia