1 The Royal (Dick) School of Veterinary Studies and The Roslin Institute, Easter Bush Campus, The University of Edinburgh, Edinburgh EH25 9RG, UK. Jessica.Martin@ed.ac.uk.
2 Animal and Veterinary Science Research Group, Scotland's Rural College (SRUC), West Mains Road, Edinburgh EH16 4SA, UK. dale.sandercock@sruc.ac.uk.
3 Animal and Veterinary Science Research Group, Scotland's Rural College (SRUC), West Mains Road, Edinburgh EH16 4SA, UK. Vicky.Sandilands@sruc.ac.uk.
4 Livetec Systems Ltd., Building 52, Wrest Park, Silsoe, Bedford MK45 4HS, UK. sparrey@livetecsystems.co.uk.
5 Animal and Veterinary Science Research Group, Scotland's Rural College (SRUC), West Mains Road, Edinburgh EH16 4SA, UK. laurence.baker@sruc.ac.uk.
6 The Royal (Dick) School of Veterinary Studies and The Roslin Institute, Easter Bush Campus, The University of Edinburgh, Edinburgh EH25 9RG, UK. Nick.Sparks@roslin.ed.ac.uk.
7 Animal and Veterinary Science Research Group, Scotland's Rural College (SRUC), West Mains Road, Edinburgh EH16 4SA, UK. Nick.Sparks@roslin.ed.ac.uk.
8 Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary & Life Sciences, University of Glasgow, Glasgow G61 1QH, UK. Dorothy.McKeegan@glasgow.ac.uk.