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Selenium in milk from feeding small supplements

T W Perry, R C Peterson, W M Beeson

    Journal of Dairy Science
    |November 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

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    Supplementing Hereford cows with varying doses of selenium (0-5 mg/day) did not significantly alter selenium levels in their milk. Milk selenium concentrations remained consistent regardless of dietary selenium intake during prepartum and lactation periods.

    Area of Science:

    • Animal Nutrition
    • Dairy Science
    • Trace Mineral Metabolism

    Background:

    • Selenium is an essential trace mineral crucial for animal health and productivity.
    • Understanding selenium's impact on milk composition is vital for dairy management.
    • Dietary selenium levels can influence milk selenium content, affecting its nutritional value.

    Purpose of the Study:

    • To investigate the effect of supplemental selenium on milk selenium concentrations in Hereford cows.
    • To determine if different daily selenium dosages impact milk selenium levels during prepartum and lactation phases.

    Main Methods:

    • Hereford cows were supplemented with 0, 1, 2, or 5 mg of selenium (as sodium selenite) daily.
    • Supplementation occurred from 90 days prepartum through approximately 6 months of lactation.

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  • Milk samples were analyzed for selenium content at 2-3 days and 3 months postpartum.

    • Main Results:

    • No significant differences in milk selenium concentrations were observed across all treatment groups.
    • Average milk selenium levels ranged from 0.014 to 0.023 ppm postpartum and 0.016 to 0.021 ppm at 3 months postpartum.
    • The basal diet included grass-legume hay, liquid supplement, and shelled corn.

    Conclusions:

    • Dietary selenium supplementation at the tested levels (up to 5 mg/day) does not significantly increase selenium content in the milk of Hereford cows.
    • Milk selenium levels appear to be relatively stable and not significantly influenced by short-term supplementation during the peripartum and early lactation periods.
    • Further research may be needed to explore longer-term effects or different selenium sources.