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This article in JEQ

  1. Vol. 37 No. 2, p. 494-500
     
    Received: Mar 19, 2007


    * Corresponding author(s): april.leytem@ars.usda.gov
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doi:10.2134/jeq2007.0134

Evaluation of Phosphorus Characterization in Broiler Ileal Digesta, Manure, and Litter Samples: 31P-NMR vs. HPLC

  1. A. B. Leytem *a,
  2. P. Kwanyuenb,
  3. P. W. Plumsteadc,
  4. R. O. Maguired and
  5. J. Brakec
  1. a USDA-ARS, Northwest Irrigation and Soils Research Lab., 3793 N. 3600 E., Kimberly, ID 83341-5076
    b USDA-ARS, Soybean and Nitrogen Fixation Research Unit, 3127 Ligon St., Raleigh, NC 27607
    c Dep. of Poultry Science, College of Agriculture and Life Sciences, North Carolina State Univ., Raleigh, NC 27695-7608
    d Crop and Soil Environmental Sciences Dep., Virginia Tech, Blacksburg, VA 24061

Abstract

Using 31-phosphorus nuclear magnetic resonance spectroscopy (31P-NMR) to characterize phosphorus (P) in animal manures and litter has become a popular technique in the area of nutrient management. To date, there has been no published work evaluating P quantification in manure/litter samples with 31P-NMR compared to other accepted methods such as high performance liquid chromatography (HPLC). To evaluate the use of 31P-NMR to quantify myo-inositol hexakisphosphate (phytate) in ileal digesta, manure, and litter from broilers, we compared results obtained from both 31P-NMR and a more traditional HPLC method. The quantification of phytate in all samples was very consistent between the two methods, with linear regressions having slopes ranging from 0.94 to 1.07 and r 2 values of 0.84 to 0.98. We compared the concentration of total monoester P determined with 31P-NMR with the total inositol P content determined with HPLC and found a strong linear relationship between the two measurements having slopes ranging from 0.91 to 1.08 and r 2 values of 0.73 to 0.95. This suggests that 31P-NMR is a very reliable method for quantifying P compounds in manure/litter samples.

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Copyright © 2008. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyAmerican Society of Agronomy, Crop Science Society of America, and Soil Science Society of America