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New candidate markers of phosphorus status in beef breeder cows

Journal

ANIMAL PRODUCTION SCIENCE
Volume 57, Issue 11, Pages 2291-2303

Publisher

CSIRO PUBLISHING
DOI: 10.1071/AN17363

Keywords

bone alkaline phosphatase; bone mobilisation; CTX-1; lactation

Funding

  1. Meat and Livestock Australia [B.NBP.0689]
  2. Queensland Department of Agriculture and Fisheries

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Determining the phosphorus (P) status of cattle grazing P-deficient rangelands in northern Australia is important for improving animal production in these areas. Plasma inorganic P concentration is currently the best diagnostic marker of dietary P deficiency in growing cattle but is not suitable for assessing the P status of breeder cows, which often mobilise substantial bone and soft tissue reserves in late pregnancy and lactation. Markers of bone turnover offer potential as markers of P status in cattle, as they reflect bone mobilisation or bone formation. Recent experiments investigating the physiology of beef breeder cows during diet P deficiency have indicated that the ratio of plasma total calcium concentration to plasma inorganic P concentration might be suitable as a simple index of P deficiency. However, a more specific measure of increased bone mobilisation in P-deficient breeders is plasma concentration of C-terminal telopeptide of Type 1 collagen. Also, plasma concentration of bone alkaline phosphatase is a marker of defective bone mineralisation in dietary P deficiency. These candidate markers warrant further investigation to determine their predictive value for P deficiency in cattle.

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