Polytocus focus: Uterine position effect is dependent upon horn size

Kristen A. McLaurin, Charles F. Mactutus

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Understanding the variability caused by uterine position effects in polytocus species, such as rats, may enhance prenatal animal models for the study of drug and environmental agents. The primiparous litters of 42 intact female Sprague-Dawley rats were studied. Uterine position, fetal body weight, and fetal brain (wet) weight were recorded on gestation day (GD) 20 (GD 0. =. sperm positive). Uterine position effect for brain and body weight varied depending upon horn size. Furthermore, an inverse relationship between horn size (and, to a lesser extent, litter size) and fetal weight applied to both body and brain weight measures. There were no statistical differences in brain and body weights between the left and right uterine horns. The position of the uterine horn (left vs. right) and litter size did not influence the uterine position effect in the rat. Collectively, the present data suggest the presence of a significant uterine position effect. Prenatal differences based on uterine position provide an untapped opportunity to increase our understanding of developmental neurotoxicological and teratological studies that employ a polytocus species as an animal model.

Original languageEnglish
Pages (from-to)85-91
Number of pages7
JournalInternational Journal of Developmental Neuroscience
StatePublished - Feb 1 2015

Bibliographical note

Publisher Copyright:
© 2014 ISDN.


  • Drug abuse
  • Environmental agents
  • Polytocus
  • Prenatal growth
  • Rats
  • Uterine position

ASJC Scopus subject areas

  • Developmental Neuroscience
  • Developmental Biology


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