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Physical influences on embryo development.

D C Deeming, K Rowlett, K Simkiss

    The Journal of Experimental Zoology. Supplement : Published Under Auspices of the American Society of Zoologists and the Division of Comparative Physiology and Biochemistry
    |January 1, 1987
    PubMed
    Summary
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    Turning chicken eggs between 3 and 7 days of incubation is crucial. Without turning, embryos experience reduced growth and increased mortality due to fluid deficiency, impacting development.

    Area of Science:

    • Embryology
    • Developmental Biology
    • Avian Science

    Background:

    • Egg turning is essential for normal avian embryo development.
    • A critical period for turning exists between 3 and 7 days of incubation in domestic fowl.
    • Absence of turning during this period is linked to adverse effects on embryo growth and survival.

    Purpose of the Study:

    • To investigate the impact of absent egg turning on embryo development.
    • To identify the physiological mechanisms underlying embryo mortality in unturned eggs.
    • To validate the role of subembryonic fluid dynamics in early embryonic development.

    Main Methods:

    • Experiments were conducted on domestic fowl eggs.
    • Specific focus on the critical incubation period (3-7 days).

    Related Experiment Videos

  • Utilized shell-less culture systems to test hypotheses.

    • Main Results:

    • Absence of turning during the critical period significantly increases embryo mortality.
    • Decreased embryo growth is observed in unturned eggs.
    • Shell-less culture experiments support the fluid deficiency hypothesis over chorion adhesion.

    Conclusions:

    • Subembryonic fluid formation and dynamics are critical during the 3-7 day incubation period.
    • Lack of turning leads to fluid deficiency and unstirred layer effects, hindering embryo development.
    • This fluid deficiency is a primary cause of mortality in unturned avian embryos.