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Related Experiment Videos

Copper deficiency in the laying hen.

S Baumgartner, D J Brown, E Salevsky

    The Journal of Nutrition
    |May 1, 1978
    PubMed
    Summary

    Copper deficiency in laying hens causes anemia and abnormal eggshells, including wrinkled, rough, and shell-less eggs. This impacts egg quality due to altered shell membranes and lysine content.

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    Area of Science:

    • Animal Nutrition
    • Poultry Science
    • Biochemistry

    Background:

    • Copper is an essential trace mineral vital for various physiological processes in poultry.
    • Eggshell quality is crucial for poultry production, impacting hatchability and marketability.
    • Previous studies have indicated potential roles for copper in connective tissue formation.

    Purpose of the Study:

    • To investigate the effects of copper deficiency on egg production and shell quality in laying hens.
    • To examine the ultrastructural changes in eggshells from copper-deficient hens.
    • To determine the biochemical alterations in eggshell membranes associated with copper deficiency.

    Main Methods:

    • Laying hens were subjected to a copper-deficient diet.
    • Egg production, size, shape, and shell characteristics were monitored.
    • Scanning electron microscopy was used to analyze eggshell ultrastructure.
    • Amino acid analysis was performed on eggshell membranes.

    Main Results:

    • Copper deficiency led to anemia and the production of abnormal eggs (size, shape, wrinkled, rough, shell-less).
    • Scanning electron microscopy revealed ultrastructural changes in the mammillary layer of malformed eggshells.
    • Eggshell membranes from deficient hens showed altered color, appearance, and consistency, with increased lysine content.

    Conclusions:

    • Copper deficiency significantly impairs eggshell formation in laying hens.
    • Alterations in eggshell membranes, particularly increased lysine, are implicated in the shell defects.
    • Copper appears essential for lysine cross-link formation in eggshell membranes, similar to connective tissue, though the specific cross-links require further investigation.

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