期刊
GENERAL AND COMPARATIVE ENDOCRINOLOGY
卷 244, 期 -, 页码 139-145出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ygcen.2015.11.006
关键词
Monotreme; Progesterone; Reproduction; Torpor; Vaginal cytology
资金
- Holsworth Wildlife Research Endowment, Australian Geographic
- National Geographic Committee for Research and Exploration [8080-06, 8685-09]
- School of Zoology, University of Tasmania
- [FA08053]
- [FA09048]
- [FA10045]
We studied the interaction between torpor and reproduction in free-ranging female Tasmanian echidnas using a combination of techniques including urogenital smears, hormone analysis, ultrasonography, external temperature loggers and camera traps. Male echidnas initiated mating activity by locating hibernating females. All females that mated or were disturbed by males prior to July 27 re-entered hibernation, including many that were pregnant. Pregnant females only entered hibernation in early pregnancy when plasma progesterone concentrations were about twice basal and progesterone then remained constant during torpor. By re-entering hibernation pregnant females extended their gestation period and delayed egg-laying. Progesterone peaked 4-6 days before egg-laying, then dropped rapidly. (C) 2015 Elsevier Inc. All rights reserved.
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