Document Detail

A gerbil dam's fetal intrauterine position affects the sex ratios of litters she gestates.
MedLine Citation:
PMID:  7716206     Owner:  NLM     Status:  MEDLINE    
The vaginally delivered litters of gerbil dams that, in utero, occupied intrauterine positions between two males fetuses (2M females) contain a greater proportion of sons than do the vaginally delivered litters of gerbil dams that were gestated between two female fetuses (2F females). This difference in the sex ratios of litters delivered vaginally by 2M and 2F gerbils might reflect sex-biased differences in perinatal mortality in the litters of 2M and 2F dams. However, the results of the present experiment, in which gerbil litters were delivered by caesarian section from females that developed in 2M and 2F intrauterine positions, demonstrated unequivocally that 2M female gerbils gestate male-biased litters, whereas 2F female gerbils gestate female-biased litters.
M M Clark; B G Galef
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Physiology & behavior     Volume:  57     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  1995 Feb 
Date Detail:
Created Date:  1995-05-17     Completed Date:  1995-05-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  297-9     Citation Subset:  IM    
Department of Psychology, McMaster University, Hamilton, Ontario, Canada.
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MeSH Terms
Fetus / physiology*
Sex Ratio*
Uterus / physiology*

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