Kym Abbott is a sheep veterinary specialist and Adjunct Professor of Sheep Medicine at The University of Adelaide. Editor of the entire work and author of 13 chapters. The following are chapter authors: Simon de Graaf is an Associate Professor of Animal Reproduction and Director of the Animal Reproduction Unit in the Faculty of Science at The University of Sydney. Associate Professor John Larsen is a senior researcher with the Mackinnon Project at The University of Melbourne Veterinary School, Werribee. Philip Hynd is Emeritus Professor of Animal Production at The University of Adelaide. Stuart Barber is Senior Lecturer in Animal Health, Welfare and Production in the Faculty of Veterinary and Agricultural Science, University of Melbourne. Tristan Jubb is a livestock production veterinarian who runs Bendigo Sheep Vets in central Victoria. David Jenkins is an Associate Professor (Veterinary Parasitology) at the School of Animal and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW. Andrew Fisher is Chair of Cattle and Sheep Production Medicine, Faculty of Veterinary and Agricultural Sciences, University of Melbourne. Gabrielle Musk is a Veterinary Anaesthetist and Veterinary Officer for Animal Care Services at the University of Western Australia Large Animal Facility, Crawley, Western Australia.