The University of Adelaide, Department of Obstetrics and Gynaecology, Queen Elizabeth Hospital, Woodville, South Australia 5011 and *Department of Agriculture and Fisheries, Kybybolite, South Australia 5262
Medical Research Council Reproductive Biology Unit, Centrefor Reproductive Biology, 37, Chalmers Street, Edinburgh EH3 9EW, and *Department of Biochemistry, University of Surrey, Guildford GU2 5XH, U.K.
Medical Research Centre, Prince Henry's Hospital, St Kilda Road, Melbourne, Victoria 3004. and Department of Agriculture and Reproduction Research Section, S.S. Cameron Laboratory, Werribee, Victoria 3030, Australia
Roman L. Hruska U.S. Meat Animal Research Center, Science and Education Administration Agricultural Research, U.S. Department of Agriculture, Clay Center, Nebraska 68933, U.SA.
Reproductive Endocrinology Program, Department of Obstetrics and Gynecology and Division of Biological Sciences, The University of Michigan, Ann Arbor, Michigan 48109, U.S.A.
Lehrstuhl für Physiologie der Fortpflanzung und Laktation, Technische Universität München, D-8050 Freising-Weihenstephan, West Germany, and *Department of Animal Physiology, University of Nairobi, Kenya
M.R.C. Reproductive Biology Unit and Department of Obstetrics and Gynaecology, Centre for Reproductive Biology, 37 Chalmers Street, Edinburgh EH3 9EW, U.K.
M.R.C. Group in Reproductive Biology, University of Western Ontario, London, Canada and *Department of Obstetrics & Gynaecology, Queen Elizabeth Hospital, University of Adelaide, Australia
Department of Physiology & Environmental Studies, University of Nottingham School of Agriculture, Sutton Bonington, Nr Loughborough, Leics LEI 2 5RD, U.K.