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Related Experiment Videos

Open-loop respiratory chemosensitivity in chickens and ducks.

D R Jones, O S Bamford

    The American Journal of Physiology
    |April 1, 1976
    PubMed
    Summary

    Avian respiratory control differs between ducks and chickens. Ducks show a peak respiratory motor burst rate (RMBR) at 40 mmHg Paco2, with depression at higher/lower levels, while chickens exhibit an RMBR independent of Paco2.

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    Area of Science:

    • * Comparative physiology
    • * Respiratory control mechanisms
    • * Avian neurobiology

    Background:

    • * Understanding avian respiratory control is crucial for comparative physiology.
    • * Previous studies have not fully elucidated respiratory center behavior under open-loop conditions.

    Purpose of the Study:

    • * To investigate avian respiratory center function under open-loop conditions.
    • * To compare respiratory motor discharge patterns in ducks and chickens during varying gas compositions.

    Main Methods:

    • * Respiratory motor burst rate (RMBR) recorded from intercostal nerves in unidirectionally ventilated, paralyzed ducks and chickens.
    • * Experiments conducted under normoxic hypercapnia, hypoxic normocapnia, asphyxia, and control conditions.

    Main Results:

    • * Duck RMBR peaked at 40 mmHg Paco2, decreasing at higher/lower values, and showed depression during asphyxia.
    • * Chicken RMBR was independent of Paco2 and Pao2, with inconsistent responses to asphyxia.
    • * Asphyxic RMBR in ducks maintained the same Paco2 relationship as during ventilation.

    Conclusions:

    • * Significant species-specific differences exist in avian respiratory control, particularly concerning Paco2 sensitivity.
    • * Ducks exhibit a distinct asphyxic respiratory depression, suggesting unique regulatory mechanisms.
    • * Further research is needed to explore the functional implications of these observed differences.

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