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Phosphorus kinetics in the sheep

N D Grace

    The British Journal of Nutrition
    |March 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Sheep phosphorus (P) metabolism was studied using lucerne chaff and ryegrass diets. Ryegrass led to higher P absorption and transport compared to lucerne chaff, indicating dietary differences impact P kinetics.

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    Area of Science:

    • Animal Nutrition
    • Biochemistry
    • Physiology

    Background:

    • Phosphorus (P) is an essential mineral for sheep health and productivity.
    • Understanding P metabolism is crucial for optimizing animal diets and preventing deficiencies or toxicities.
    • Dietary P availability can vary significantly based on forage type.

    Purpose of the Study:

    • To determine kinetic indices of phosphorus metabolism in sheep fed different diets.
    • To compare phosphorus absorption and transport rates between lucerne chaff and Ruanui ryegrass.
    • To model phosphorus dynamics within the sheep body.

    Main Methods:

    • Ten castrated adult sheep were fed either lucerne chaff or Ruanui ryegrass.
    • Nutritional balance and 32P radioactivity measurements were employed.

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  • A four-compartmental model (M1-M4) was used with the SAAM program for data analysis.

    • Main Results:

    • Sheep fed Ruanui ryegrass had higher total P transport (VT) to the exchangeable pool compared to those fed lucerne chaff.
    • Phosphorus absorption (Va), fecal endogenous loss (Vf), urinary excretion (Vu), and skeletal/soft tissue P movement were lower with lucerne chaff.
    • P availability was 0.56 for lucerne chaff and 0.62 for Ruanui ryegrass.

    Conclusions:

    • Dietary P absorption and kinetics are influenced by forage type in sheep.
    • Ruanui ryegrass provides more readily available phosphorus than lucerne chaff.
    • Individual variations in P metabolism, such as elevated plasma inorganic P, can be linked to specific kinetic alterations.