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Developing visual function in the red jungle fowl embryo

M B Heaton

    Journal of Comparative and Physiological Psychology
    |January 1, 1976
    PubMed
    Summary
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    The visual system in wild red jungle fowl embryos develops its first pupillary reflex around Day 15 of incubation. This timing is similar to domestic chicks, suggesting domestication isn't the cause of delayed visual function in chicks.

    Area of Science:

    • Developmental Biology
    • Neuroscience
    • Comparative Embryology

    Background:

    • The onset of visual system function is a key developmental milestone in avian embryos.
    • Domestic chicks (Gallus gallus domesticus) exhibit a relatively late onset of visual function compared to other precocial birds.
    • The role of domestication in this delayed development remains unclear.

    Purpose of the Study:

    • To determine the onset of neurally mediated pupillary reflex in wild red jungle fowl (Gallus gallus) embryos.
    • To compare the timing of visual system function onset between wild red jungle fowl and domestic chicks.
    • To investigate whether domestication influences the developmental timing of visual function in chicks.

    Main Methods:

    • Utilized the pupillary reflex technique to measure visual system function.

    Related Experiment Videos

  • Incubated and monitored wild red jungle fowl embryos.
  • Compared the developmental stage at which the pupillary reflex first appeared in both species.

    • Main Results:

    • The first neurally mediated pupillary reflex in wild red jungle fowl embryos was observed at Day 15 of incubation (77% completion).
    • This onset point was not significantly different from that observed in domestic chick embryos (approx. 83% incubation).

    Conclusions:

    • The late onset of overt visual system function in domestic chicks is likely a species-specific characteristic, not solely a consequence of domestication.
    • Wild red jungle fowl and domestic chicks share a similar, relatively late developmental timeline for visual system function.
    • This finding provides insights into avian developmental biology and the evolutionary pressures on domesticated species.