Effect of species and plant part on n-alkane concentrations in the cuticular wax of common browse mpastures from Middle Ebro Valley (Spain) | Effet de l'espèce et de la partie de la plante sur les concentrations des n-alkanes dans le cuticule de cire des arbustes des parcours de la moyenne vallée de l'Ebre (Espagne)
2005
Pueyo, Y.(Instituto Pirenaico de Ecología (CSIC), Campus de Aula Dei, Zaragoza (Spain)) | De Vega, A. | Askar, A.R. | Guada, J.A.
Diet selection is important for pasture ecology and animal production, and can be estimated using plant alkane concentrations provided they differ markedly between plant species or parts. To learn about the possibility of identifying different browse pastures or their anatomical fractions as components of the diet in grazing ruminants, freeze-dried samples were ground, and n-alkanes extracted and analysed by gas chromatography. Concentrations of individual hydrocarbons were expressed as proportion of the total amount and analysed by way of stepwise discriminant analysis, which was a useful tool for classification of a priori defined groups (species and plant parts). The best discriminant alkanes were those with odd-chain number of carbons (except C21 and C27) plus C30 and C32, the two latter even at low concentrations. As conclusion, n-alkane profiles in the studied species and plant parts were different enough to allow their identification as components of the diet in grazing ruminants
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