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The position effect in mice on day 19.

T Louton1, H Domarus, P Hartmann

  • 1Biometrie und Statistik, Schering AG, Berlin, Federal Republic of Germany.

Teratology
|July 1, 1988
PubMed
Summary
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Fetal position within the uterine horn influences weight in NMRI mice. Fetuses nearer the cervix were lighter, while those near the ovary were heavier, indicating a significant position effect.

Area of Science:

  • Developmental biology
  • Reproductive science
  • Animal models

Background:

  • The position of fetuses within the uterine horn can be influenced by various factors.
  • Understanding these influences is crucial for interpreting developmental studies.

Purpose of the Study:

  • To investigate the position effect on fetal weight in NMRI mice.
  • To quantify the relationship between relative fetal position and fetal weight.

Main Methods:

  • Analysis of 610 fetuses from 51 litters of NMRI mice at day 19 of gestation.
  • Determination of relative fetal position based on placental distance from the cervix.
  • Fetal weight measurement and mixed model analysis of variance to assess position effect.

Main Results:

Related Experiment Videos

  • A significant position effect on fetal weight was identified.
  • Fetuses at the cervical end of the uterine horn were lighter than average.
  • Fetuses at the ovarian end were heavier than average, while those in the middle showed average weight.

Conclusions:

  • Fetal position within the uterine horn is a determinant of fetal weight in mice.
  • This position-dependent weight variation should be considered in developmental and reproductive research.