The effect of treatment with a GnRH analogue on postpartum reproductive performance in Friesian cows |
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| Affiliation: | 1. Faculty of Agriculture, University of Mansoura, El Mansoura Egypt;2. Animal Production Research Institute, Ministry of Agriculture, Cairo Egypt;1. Department of Clinical Medicine, University of Aarhus, Aarhus, Denmark;2. Department of Urology, Aarhus University Hospital, Aarhus, Denmark;1. Department of Urology, Krankenhaus Hietzing mit Neurologischem Zentrum Rosenhügel, Vienna, Austria;2. Department of Laboratory Medicine, Krankenhaus Hietzing mit Neurologischem Zentrum Rosenhügel, Vienna, Austria;3. Karl Landsteiner Institute for Clinical Risk Management, Vienna, Austria;4. Department of Urology, Royal Bournemouth and Christchurch Hospitals NHS Foundation Trust, Bournemouth, United Kingdom;5. Department of Surgery, University of Cambridge, Cambridge, United Kingdom;1. Department of Veterinary Science and Public Health, University of Milan, via Celoria 10, 20133 Milan, Italy;2. Central Laboratory, Veterinary Teaching Hospital, University of Milan, via dell’Università 6, 26900 Lodi, Italy;3. Institute of Zootechnics, Faculty of Agriculture, Università Cattolica del Sacro Cuore, via Emilia Parmense 84, 29122 Piacenza, Italy;4. Parco Tecnologico Padano, via Einstein, Loc. Cascina Codazza, 26900 Lodi, Italy;3. Department of Biomedical Sciences, University of Padova, 35121 Padova;4. Venetian Institute of Molecular Medicine, University of Padova, 35129 Padova, Italy;2. Istituto Zooprofilattico Sperimentale delle Venezie, Viale dell’Università 10, 35020 Legnaro (PD), Italy;1. Institute of Muscle Biology and Growth, Leibniz Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196 Dummerstorf, Germany;2. Institute of Nutritional Physiology “Oskar Kellner,” Leibniz Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196 Dummerstorf, Germany;3. Institute of Genetics and Biometry, Leibniz Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196 Dummerstorf, Germany |
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| Abstract: | Three trials were conducted to examine the effect of GnRH injection on the reproductive performance of Friesian cows. In the first trial 100 μg gonadotrophin releasing hormone synthetic analogue (GnRH) was given at the time of A.I. to 32 cows while a control group received a saline placebo injection. Conception rate to first insemination was significantly higher in treated than control cows (81.3 v. 54.8%, P < 0.05).In the second trial, two groups of 19 cows each received either 100 μg GnRH or saline at 15 days postpartum. A total of 60 cows was used in the third trial in which GnRH was given at either 50 or 100 μg dose level on either days 7 or 15 postpartum while control cows were untreated. In both trials GnRH treatment reduced the intervals from calving to complete uterine involution, first ovulation and first detected oestrus. The effect was most pronounced when 100 μg GnRH was given on day 7 postpartum. Number of days open and number of services per conception were appreciably reduced when 100 μg GnRH was given at either 7 or 15 days postpartum with maximal effect when given 15 days after calving. |
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