Reproductive hormone concentrations during estrus,pregnancy, and pseudopregnancy in the Labrador bitch |
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| Institution: | 1. Department and Clinic of Infectious Diseases, Faculty of Veterinary Medicine, University of Agricultural Science and Veterinary Medicine, 3-5 Calea M?n??tur St, 400372 Cluj-Napoca, Romania;2. Department and Clinic of Animal Reproduction, Faculty of Veterinary Medicine, University of Life Sciences in Lublin, 30 Gleboka St, 20-612 Lublin, Poland;3. Interdisciplinary Laboratory of Clinical Analysis Interlab-UMU, Faculty of Veterinary Medicine, Regional Campus of International Excellence ‘Campus Mare Nostrum’, University of Murcia, Espinardo, Murcia 30100, Spain;4. Department and Clinic of Reproduction, Obstetrics and Gynecology, Faculty of Veterinary Medicine, University of Agricultural Science and Veterinary Medicine, 3-5 Calea M?n??tur St, 400372 Cluj-Napoca, Romania;5. Department of Animal Medicine and Surgery, Veterinary School, University Autonoma of Barcelona, Barcelona, Spain;1. Department of Animal Medicine Production and Health-University of Padova, via dell’Università 16, 35020 Legnaro, PD, Italy;2. Department of Obstetrics and Gynaecology, Faculty of Veterinary Medicine, Istanbul, Turkey;1. Institute of Veterinary Anatomy, Vetsuisse Faculty, University of Zurich, Zurich, Switzerland;2. Department of Reproductive Immunology and Pathology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Olsztyn, Poland;3. Department of Animal Reproduction, University of Warmia and Mazury, Olsztyn, Poland;4. Clinic for Obstetrics, Gynaecology and Andrology of Large and Small Animals, Faculty of Veterinary Medicine, Justus-Liebig-University Giessen, Giessen, Germany;1. Department of Veterinary Sciences, Torino, Italy;2. Department of Animal Medicine Production and Health, Padova, Italy;3. Department of Clinical Sciences, Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden;1. School of Animal Biology, University of Western Australia, Crawley, WA 6009, Australia;2. Institute for Breeding Rare and Endangered African Mammals (IBREAM), 9 Ainslie Place, Edinburgh, EH3 6AT, UK;3. Botswana Predator Conservation Trust, Private Bag 13, Maun, Botswana;4. Nuffield Department of Obstetrics & Gynaecology, University of Oxford, Oxford OX3 9DU, UK;5. Zoo Duisburg, Mülheimer Straße 273, 47058 Duisburg, Germany;6. Port Lympne Wild Animal Park, Lympne, Kent, CT21 4PD, UK;7. Mammal Research Institute, University of Pretoria, Private Bag X20 Hatfield, Pretoria 0028, South Africa;1. Department of Production Animals, Faculty of Veterinary Science, University of Pretoria, South Africa;2. Department of Paraclinical Sciences, Faculty of Veterinary Science, University of Pretoria, South Africa |
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| Abstract: | Serum luteinizing hormone (LH), estrone, estradiol-17β, and progesterone were measured during the estrous cycle, pregnancy and parturition in seven adult pregnant Labrador bitches and during the estrous cycle and one gestation length equivalent in six adult pseudopregnant bitches. Although the duration of proestrus was similar in both groups, the duration of estrus was longer in the bitches that subsequently became pregnant. Mean serum LH concentrations were similar in both groups during most of the study. However, during Weeks 6 to 9 after the preovulatory LH peak, serum LH concentration was higher in both pseudopregnant and pregnant groups of animals and declined to basal levels thereafter. Mean serum estrone concentrations in the pregnant animals were higher than those of pseudopregnant animals and remained elevated throughout gestation, followed by a decline at whelping. Serum estradiol-17β levels were higher during the 4 wkimmediately following ovulation in the pseudopregnant group compared with those observed in pregnant animals. Serum progesterone concentrations generally remained higher during pseudopregnancy compared with those of the pregnant animals during gestation.In conclusion, a major difference between pregnant and pseudopregnant bitches is a pregnancy-specific elevation in estrone levels. The placenta may be a likely source of estrone during pregnancy. |
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