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Related Experiment Videos

Changes in bone fragility in laying hens.

R H Harms, A S Arafa

    Poultry Science
    |September 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Age significantly impacts laying hen tibia strength, with cage confinement exacerbating bone fragility. Tibia ash content increased with age, but housing type showed no long-term effect on ash levels.

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    Area of Science:

    • Animal Science
    • Poultry Science
    • Bone Physiology

    Background:

    • Laying hen welfare and productivity are influenced by skeletal health.
    • Tibia strength and ash content are key indicators of bone integrity in poultry.
    • Housing systems, such as cages and floor pens, may affect bone development.

    Purpose of the Study:

    • To investigate the effects of aging on tibia ash and breaking strength in Hy-Line W36 laying hens.
    • To compare the influence of cage versus floor pen housing on these bone parameters.
    • To assess the impact of switching housing environments on tibia properties.

    Main Methods:

    • Hy-Line W36 hens were housed in cages and floor pens from 20 to 32 weeks of age.
    • Tibia ash content and breaking strength were measured at various time points.

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  • A subset of hens was transferred between housing systems at 26 weeks of age to evaluate adaptation.

    • Main Results:

    • Tibia breaking strength decreased with age in both housing systems, with a more pronounced decline in cages.
    • Tibia ash content increased with age, with no significant differences between housing types after 23 weeks.
    • Hens moved from cages to floor pens maintained breaking strength, while those moved from floor to cages experienced a decrease.

    Conclusions:

    • Age is a critical factor in the decline of tibia breaking strength in laying hens.
    • Cage confinement appears to accelerate the reduction in tibia strength compared to floor pens.
    • Environmental housing plays a role in bone strength adaptation, particularly when transitioning from floor to cage systems.