Document Detail

Different types of oestrous cycle in two closely related South American rodents (Cavia aperea and Galea musteloides) with different social and mating systems.
MedLine Citation:
PMID:  11427168     Owner:  NLM     Status:  MEDLINE    
A comparative approach was used to investigate two closely related South American rodent species: the wild cavy (Cavia aperea) and the yellow-toothed cavy (Galea musteloides). These species of wild guinea-pig inhabit different habitats and show divergent social and mating systems. Cavia have a polygynous mating system, whereas in Galea promiscuous mating occurs. These observations correspond to functional variations in sperm characteristics, which might be interpreted as adaptations to different reproductive patterns in the females of both species. Twenty-two female C. aperea and G. musteloides (11 of each species) were investigated to elucidate differences in the characteristics of the oestrous cycles. The experimental design consisted of three stages, in which the degree of contact between the sexes was successively changed. During these stages, the reproductive cycle of the females was monitored by examining the condition of the vaginal closure membrane, analysing vaginal smears and determining serum concentrations of oestrogens and progesterone. The results revealed different types of oestrous cycle in the two species. Female C. aperea showed periodical cycles with spontaneously occurring oestrous periods, ovulation and corpus luteum activity. In contrast, in female G. musteloides, oestrus was exclusively induced by the presence of a male. However, after the induction of oestrus, ovulation and corpus luteum activity occurred spontaneously without stimuli from copulation. To date this type of oestrous cycle has not been described for any other mammalian species. Thus, these data indicate that differences in the reproductive patterns of the females may have shaped the evolution of different sperm characteristics in the males.
C Touma; R Palme; N Sachser
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Reproduction (Cambridge, England)     Volume:  121     ISSN:  1470-1626     ISO Abbreviation:  Reproduction     Publication Date:  2001 May 
Date Detail:
Created Date:  2001-06-27     Completed Date:  2001-08-09     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100966036     Medline TA:  Reproduction     Country:  England    
Other Details:
Languages:  eng     Pagination:  791-801     Citation Subset:  IM    
Institute of Neuro and Behavioural Biology, Department of Behavioural Biology, University of Münster, Badestrasse 9, D-48149 Münster, Germany.
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MeSH Terms
Corpus Luteum / physiology
Estrogens / blood
Guinea Pigs / physiology*
Progesterone / blood
Sexual Behavior, Animal*
Social Behavior*
South America
Species Specificity
Time Factors
Vagina / physiology
Vaginal Smears
Reg. No./Substance:
0/Estrogens; 57-83-0/Progesterone

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

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