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Dietary phosphorus for beef cows.

J W Call, J E Butcher, J L Shupe

    American Journal of Veterinary Research
    |February 1, 1986
    PubMed
    Summary
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    Beef cattle require less dietary phosphorus (P) than commonly recommended. Studies show 12 g of P/day is adequate for 450-kg cows, with bones buffering needs during short-term deficiencies.

    Area of Science:

    • Animal Nutrition
    • Ruminant Physiology
    • Mineral Metabolism

    Background:

    • Dietary phosphorus (P) is essential for cattle health and reproduction.
    • Current recommendations for P intake in beef cattle may exceed actual requirements.
    • Understanding P requirements is crucial for optimizing livestock production and health.

    Purpose of the Study:

    • To determine the minimum dietary phosphorus (P) requirements for Hereford heifers through gestation.
    • To evaluate the effects of varying P intake on clinical signs, performance, and reproductive capacity.
    • To assess the role of bone as a P reservoir in beef cattle.

    Main Methods:

    • Individually fed 48 Hereford heifers variable P diets from weaning to 8th gestation.
    • Two dietary phases were implemented, with P levels adjusted based on animal growth and gestation stage.

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  • Specific groups received reduced P levels (5.1–6.6 g/day) during phase II to induce deficiency, followed by repletion.

    • Main Results:

    • Heifers fed 5.1–6.6 g P/day developed deficiency signs within 6 months, including weight loss, reduced feed intake, and impaired reproduction.
    • P-deficient heifers recovered health and reproductive function upon repletion with adequate P levels (11.7–20.5 g/day).
    • Diets providing 7.8–8.9 g P/day did not result in discernible deficiency signs.

    Conclusions:

    • Bones effectively store and buffer phosphorus, supporting bodily needs during periods of low intake.
    • The National Research Council's P recommendations (17.5 g/day for 450-kg cows) likely exceed the actual requirements for beef cattle.
    • A daily intake of 12 g P is sufficient for 450-kg beef cows, indicating current guidelines may be overly generous.