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Related Experiment Videos

Calcium logistics in the laying hen.

R J Etches

    The Journal of Nutrition
    |March 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Hens accrue calcium (Ca2+) in medullary bone during daylight and mobilize it at night for eggshell formation. Dietary calcium intake, especially from oyster shell, influences this process.

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    Area of Science:

    • Animal Physiology
    • Reproductive Biology
    • Bone Metabolism

    Background:

    • Eggshell formation in domestic hens is a rapid process requiring substantial calcium.
    • Calcium homeostasis is tightly regulated, especially during the ovulatory cycle.
    • Medullary bone serves as a crucial calcium reservoir for eggshell calcification.

    Purpose of the Study:

    • To calculate hourly changes in calcium (Ca2+) content in physiological compartments of the domestic hen during a 4-day ovulatory sequence.
    • To investigate the influence of circadian rhythms, dietary calcium sources, and shell formation stage on calcium dynamics.
    • To elucidate the role of medullary bone in calcium management for eggshell production.

    Main Methods:

    • Quantitative analysis of calcium content in various hen physiological compartments.

    Related Experiment Videos

  • Modeling of calcium accretion and mobilization based on hourly data.
  • Consideration of dietary calcium (complete feed vs. oyster shell) and feeding times.
  • Integration of ovulatory sequence and shell formation stage into calculations.

    • Main Results:

    • Medullary bone accrues Ca2+ during the photophase (day).
    • Ca2+ is mobilized from medullary bone during the scotophase (night) when shell calcification is active.
    • Hens ingest significant Ca2+ at the end of the photophase when fed oyster shell.
    • Ingested Ca2+ is temporarily stored in medullary bone and released to the digestive tract during the early scotophase.

    Conclusions:

    • Medullary bone plays a dynamic role in buffering and supplying calcium for eggshell formation.
    • Circadian rhythms in calcium intake and utilization are critical for efficient shell production.
    • Estrogen and parathyroid hormone interactions likely regulate medullary bone's response to calcium demands during shell formation.