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Related Experiment Videos

Low release of selenium from recovered ruminal pellets

J F Wilkins, B A Hamilton

    Australian Veterinary Journal
    |February 1, 1980
    PubMed
    Summary

    Selenium pellets showed declining effectiveness in Merino sheep over time. Blood selenium levels dropped significantly 5-13 months post-treatment, indicating poor sustained release from the pellets.

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    Area of Science:

    • Animal Science
    • Veterinary Medicine
    • Nutritional Biochemistry

    Background:

    • Selenium is a vital trace element for sheep health, impacting immune function and antioxidant status.
    • Selenium supplementation in sheep often utilizes slow-release pellets for sustained delivery.
    • The long-term efficacy and release kinetics of selenium pellets require thorough investigation.

    Purpose of the Study:

    • To evaluate the effectiveness and duration of selenium supplementation using slow-release pellets in grazing Merino sheep.
    • To assess the selenium status of sheep over a 13-month period following pellet implantation.
    • To determine the bioavailability and release rate of selenium from implanted pellets.

    Main Methods:

    • Comparison of selenium status (via blood glutathione peroxidase levels) between treated and untreated Merino sheep over 13 months.
    • Recovery and bioassay of used selenium pellets administered to sheep on a deficient diet.
    • Monitoring selenium status in sheep receiving previously unused pellets.

    Main Results:

    • Blood selenium levels in treated sheep peaked at 3 months, then declined markedly between 5 and 13 months.
    • Recovered pellets from slaughtered sheep showed minimal available selenium, confirmed by bioassay.
    • Sheep administered recovered pellets maintained low selenium status.
    • Selenium status in sheep receiving new pellets began declining after 18 weeks.

    Conclusions:

    • Slow-release selenium pellets demonstrate limited long-term effectiveness in grazing Merino sheep due to poor sustained release.
    • The bioavailability of selenium from these pellets diminishes significantly over time.
    • Alternative or supplementary selenium supplementation strategies may be necessary for maintaining adequate selenium status in sheep.

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