Peri-pubertal ovulatory events and progesterone profiles of Javanese thin-tail sheep |
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| Institution: | 1. Balai Penelitian Ternak, P.O. Box 123 Bogor Indonesia;2. Department of Animal Science, University of New England, Armidale, N.S.W. 2351 Australia;1. Department of Infrastructure Engineering, The University of Melbourne, Parkville, Australia;2. School of Civil and Environmental Engineering, The University of New South Wales, Kensington, Australia;3. Department of Engineering, University of Cambridge, United Kingdom;1. Institut de Pharmacologie Moléculaire et Cellulaire, LabEx ICST, UMR 7275 CNRS, Université de Nice Sophia Antipolis, 06560 Valbonne, France;2. INSERM U970, PARCC-Université Paris Descartes-Hôpital Européen Georges Pompidou, AP-HP, 75015 Paris, France;3. CNRS UMR 6214, INSERM U1083, CARFI Facility and Université d’Angers, 49045 Angers Cédex 01, France;4. Max Planck Institute for Heart and Lung Research, 61231 Bad Nauheim, Germany;5. Division of Translational Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA;6. Department of Neurology, Northwestern University, Chicago, IL 60611, USA |
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| Abstract: | Pre- and post-pubertal progesterone profiles and ovarian activity of 24 Javanese thin-tail ewe lambs were studied under research-station conditions. The results showed that immaturity of ovarian function before the animals reached puberty was characterized by the occurrence of ovulation without oestrus (66.7%), oestrus without ovulation (12.5%) and failure in some ewe lambs to maintain regular ovarian activity following their first ovulation. A high proportion (39.5%) of corpora lutea was not fully functional. Some pronounced increases in plasma-progesterone concentration were observed before first ovulation, while an ovulation observed by laparoscopy was not always followed by a marked increase in plasma-progesterone concentration. Once the animals reached puberty, the levels and the patterns of change in plasma-progesterone concentration during a cycle or in early pregnancy were similar to those commonly observed in temperate breeds. |
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