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Birth sequence in mice.

G B Fuller, G E McGee, J C Nelson

    Laboratory Animal Science
    |April 1, 1976
    PubMed
    Summary
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    Mouse parturition birth order is random, with deliveries from either uterine horn being unpredictable. However, females were more likely to deliver their first pup from the right uterine horn, suggesting right-sided physiological dominance.

    Area of Science:

    • Reproductive Biology
    • Developmental Biology
    • Mammalian Reproduction

    Background:

    • Understanding parturition and birth order is crucial in reproductive studies.
    • The concept of uterine horn dominance in mammalian birth has been previously hypothesized.

    Purpose of the Study:

    • To investigate the birth order succession during parturition in mice.
    • To determine if birth order is random or influenced by uterine horn.
    • To explore potential physiological dominance in the mouse reproductive tract.

    Main Methods:

    • In utero marker injection in pregnant mice to track individual pup delivery.
    • Observation and recording of the sequence of deliveries from each uterine horn.
    • Statistical analysis to assess randomness of birth order and horn preference.

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    Main Results:

    • Data did not support a non-random birth order; delivery sequence was unpredictable.
    • A statistically significant higher incidence of the first pup being delivered from the right uterine horn was observed.
    • This finding supports the hypothesis of a physiological dominance of the right uterine horn.

    Conclusions:

    • Parturition succession in mice appears to be a random process regarding uterine horn origin.
    • A significant bias towards the right uterine horn for the first delivery suggests a physiological advantage or dominance.
    • Further research is warranted to elucidate the mechanisms behind this right-sided dominance in mouse reproduction.