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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.

|July 1, 1988

Summary

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.

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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:

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.

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