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[A decrease in blood beta-carotene in dairy cows during late pregnancy period].

M Lebeda

    Veterinarni Medicina
    |September 1, 1986
    PubMed
    Summary

    Beta-carotene levels in dairy cows vary by lactation and pregnancy stage. Winter feeding significantly depletes beta-carotene, necessitating vitamin A supplementation and potentially impacting reproductive health.

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    Area of Science:

    • Animal Nutrition
    • Biochemistry
    • Reproductive Physiology

    Context:

    • Beta-carotene is a vital precursor to vitamin A, essential for animal health and productivity.
    • Lactation and pregnancy significantly influence nutrient requirements and metabolic status in dairy cows.
    • Seasonal variations in feed quality and availability impact nutrient intake and blood metabolite levels.

    Purpose:

    • To investigate the seasonal and physiological variations in plasma beta-carotene concentrations in dairy cows.
    • To assess the adequacy of beta-carotene levels during different reproductive stages and feeding seasons.
    • To determine critical thresholds for beta-carotene related to vitamin A status and reproductive health.

    Summary:

    • Plasma beta-carotene concentrations were measured in 3441 cows across four feeding seasons (1980-1984) during different lactation and pregnancy phases.
    • Cows in mid-lactation exhibited the highest beta-carotene levels, while pregnant cows (8th-9.5th months) and early-lactating cows showed significant decreases.
    • During winter feeding, mean beta-carotene levels fell below recommended thresholds, indicating potential vitamin A deficiency and risks to reproductive processes.

    Impact:

    • Highlights the critical need for vitamin A fortification in dairy cow diets, especially during winter feeding periods.
    • Identifies specific physiological states (late pregnancy, early lactation) where beta-carotene levels are critically low.
    • Provides evidence for the link between suboptimal beta-carotene status and potential reproductive disorders in dairy herds.

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