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Protocol for the analysis of n-alkanes and other plant-wax compounds and for their use as markers for quantifying the nutrient supply of large mammalian herbivores

Nature Protocols volume 1, pages 1680–1697 (2006)Cite this article

Abstract

Plant-wax markers can be used for estimating forage intake, diet composition and supplement intake in grazing livestock, wild ruminants and other mammals. We describe protocols for using the saturated hydrocarbons (alkanes) of plant wax as markers for estimating fecal output, intake and digestibility. Procedures for investigating digestion kinetics are also discussed. Alkanes can also be used to estimate diet composition and the procedures required to do this are also described, including the special case where supplementary feed is treated as a component of the diet composition estimate. The long-chain alcohols (LCOHs) and very long-chain fatty acids (VLCFAs) of plant wax show particular promise for discriminating a greater number of species in the diet. The use of all these plant-wax markers in nutrition studies depends on having quantitative, repeatable and mutually compatible assay procedures for alkanes, LCOHs and VLCFAs; we present protocols for these assays in detail. Analysis of a single sample of feces or plant material for all these plant-wax markers can be completed within 2 days; however, it is possible to process up to 50 samples (analyzed in duplicate) per week.

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Figure 1: Fecal excretion curves of herbage alkane.
Figure 2: Gas chromatograph trace.

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  1. CSIRO Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia

    Hugh Dove

  2. The Macaulay Institute, Craigiebuckler, AB15 8QH, Aberdeen, UK

    Robert W Mayes

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  1. Hugh Dove
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Correspondence to Hugh Dove or Robert W Mayes.

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Supplementary Protocol

Supplementary protocol for the formation of trimethylsilyl (TMS) derivatives of LCOH (PDF 91 kb)

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Dove, H., Mayes, R. Protocol for the analysis of n-alkanes and other plant-wax compounds and for their use as markers for quantifying the nutrient supply of large mammalian herbivores. Nat Protoc 1, 1680–1697 (2006). https://doi.org/10.1038/nprot.2006.225

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