Document Detail


Observations on the female reproductive cycle of captive giant tortoises (Geochelone spp.) using ultrasound scanning.
MedLine Citation:
PMID:  9365938     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The reproductive activities of one adult female Galápagos tortoise (Geochelone nigra) and three adult female Aldabra tortoises (Geochelone gigantea) were monitored over 2 yr using ultrasound scanning. A nonrestraining technique of tactile stimulation was used for all examinations. Developing, preovulatory, and atretic ovarian follicles, as well as eggs at various stages of shell deposition, were identified and measured. In G. nigra, follicles became preovulatory at a diameter of 40-42 mm and eggs were laid 34-84 days (mean = 55.6, n = 5) after the thin-shelled eggs were first detected in the oviducts. Geochelone nigra was capable of retaining eggs, with the shell already formed, until the next breeding season. No eggs have been produced by G. gigantea during their stay in Zürich Zoo although follicles of 38-40 mm have been observed frequently in two animals.
Authors:
M Casares; A Rübel; R E Honegger
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of zoo and wildlife medicine : official publication of the American Association of Zoo Veterinarians     Volume:  28     ISSN:  1042-7260     ISO Abbreviation:  J. Zoo Wildl. Med.     Publication Date:  1997 Sep 
Date Detail:
Created Date:  1998-02-05     Completed Date:  1998-02-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8915208     Medline TA:  J Zoo Wildl Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  267-73     Citation Subset:  IM    
Affiliation:
Zürich Zoological Gardens, Switzerland.
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Zoo / anatomy & histology,  physiology*
Breeding
Female
Ovarian Follicle / physiology,  ultrasonography
Ovary / physiology*,  ultrasonography
Oviposition / physiology
Ovum / cytology,  physiology,  ultrasonography
Reproduction / physiology*
Seasons
Time Factors
Turtles / anatomy & histology,  physiology*
Uterus / physiology*,  ultrasonography

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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