1. Centre for Advanced Technologies in Animal Genetics and Reproduction, Faculty of Veterinary Science, RMC Gunn Building, University of Sydney, Sydney, New South Wales 2006, Australia
2. Porosus Pty. Ltd., P.O. Box 86, Palmerston, Northern Territory 0831, Australia
3. Faculty of Veterinary Science, Chulalongkorn University, Pathumwan, Bangkok, 10330, Thailand
4. OIC Berrimah Veterinary Laboratories, Department of Primary Industry, Fisheries and Mines, GPO Box 3000 Darwin, Northern Territory 0801, Australia