Functional classification by NIRS of plant parts selected by sheep on a shrubby rangeland

Silué Nahoulé, Bastianelli Denis, Meuret Michel, Hassoun Philippe, Jouven Magali. 2016. Functional classification by NIRS of plant parts selected by sheep on a shrubby rangeland. In : Ecosystem services and socio-economic benefits of Mediterramean grasslands. Kyriazopoulos A.P. (ed.), López-Francos A. (ed.), Porqueddu C. (ed.), Sklavou P. (ed.). CIHEAM. Zaragoza : CIHEAM-IAMZ, 71-74. (Options Méditerranéennes, Series A: Mediterranean Seminars, 114) ISBN 2-85352-556-2 Meeting of the Mediterranean sub-network of the FAO-CIHEAM international network for the research and development of pastures and fodder crops. 15, Orestiada, Grèce, 12 Avril 2016/14 Avril 2016.

Résumé : The diet of livestock foraging on rangelands is highly diversified and changes daily, seasonally and annually. Thus, a classical assessment of diet nutritive value with forage sampling followed by chemical analysis would be too challenging. We explore an alternative method to characterize the diversity of food offered based upon the classification of food items into a limited number of “ functional” nutritive classes. The area of study was a Mediterranean garrigue rangeland, grazed by sheep in spring. Based on sheep foraging behavior, 103 food items were identified as “ bite categories” (BCs), from 60 plant ant species; 245 samples were taken. They were oven dried and grinded before Near-infrared spectra (NIRS) collection. Hierarchical classification of NIRS spectra produced “functional” classes of BCs. A few classes were homogeneous while others gathered plants from diverse botanical origins, but displaying similar characteristics such as chemical composition. Other Mediterranean rangelands and other grazing periods need to be studied in order to validate the functional nutritive classes identified. This method paves the way to better characterize the potential nutritive value of rangelands by taking into account foraging selection at bite level.

Classification Agris : L02 - Alimentation animale
U30 - Méthodes de recherche
F70 - Taxonomie végétale et phytogéographie

Auteurs et affiliations

• Silué Nahoulé, Montpellier SupAgro (FRA)
• Bastianelli Denis, CIRAD-ES-UMR SELMET (FRA) ORCID: 0000-0002-6394-5920
• Meuret Michel, INRA (FRA)
• Hassoun Philippe, INRA (FRA)
• Jouven Magali, Montpellier SupAgro (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/580400/)

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