Use of near infrared reflectance spectroscopy to predict chemical composition of some pastoral species appeased by the dromedaryin southern Tunisia

Benrejeb M., Dbara M., Dadi K., Bonnal Laurent, Hajji H., Khorchani T.. 2018. Use of near infrared reflectance spectroscopy to predict chemical composition of some pastoral species appeased by the dromedaryin southern Tunisia. In : Recent advances in camelids biology, health and production : Proceedings of the 5th conference ISOCARD 2018. Sghiri Abdelmalek (ed.), Kichou Faouzi (ed.). Laâyoune : ISOCARD, Résumé, 570. ISBN 978-9920-36-565-9 Conference of the international society of camelid research and development ISOCARD 2018. 5, Laâyoune, Maroc, 12 Novembre 2018/15 Novembre 2018.

Résumé : The Near Infra red Spectroscopy (NIRS) is an analytical technique based on the principle of absorption of infra red radiation in relation with the chemical composition of the material. Over the past three decades, NIRS has been proved to be one of the most efficient and advanced tools for the estimation of feed quality. The objective of this study was to predict the composition of mineral content (Ash), crude protein (CP) and fiber contents (NDF, ADF) using NIRS method(n=376) of the topten most abandoned pastoral species on the grasslands even during the drier years and palatable by the Arabian camel (Came/us dromedarius).These species (Retamaretam, Haloxylonschmittianum, Suaedamo/lis, Salsolatetrandra, Zygophyllum album, Atriplexhalimus, Halocnemumstrobilaceum, Limoniastrumguyonianum, Nitrariaretusa and Frankiniathyfolia) collected from two sites of southern Tunisia (Kebili and Mednine) during four seasons between 2014 and 2015. The most accurate model was obtained forAsh with R2=0.93, Root Mean Square Error of Estimation (RMSEE)=2.33, Ratio Performance Deviation (RPD)=3.8).Fiber contents (NDF, ADF) prediction models were satisfactory and the R2 and RPO values were (0.84 and 0.89; 2.5 and 3.09), respectively for NDF, ADF. The model for crude protein was less accurate and needs enrichment (R2=0.83, RMSEE=1.29 and RPD= 2.46). Validation on an independent set of samples (n= 20) of three pastoral species(Zygophy//um album, Retamaretam, Haloxylon schmittianum) collected from another course of South Tunisian (Matmata) yielded comparable results after having analyzed in the laboratory for CP, and ADF using wet chemical analysis.the following results were obtained respectively (9.5 and 20.8), (9.2 and 54.3), (5.4 and 28.1) and prediction with models already created give in the same order (8.33, 19.22), (8.36 ,39.28), (4.55, 26.60). Based on these results, NIR spectroscopy can be used to predict chemical composition ofpastoral speciesinarid and desert regionswhich are essential to know the quality of the fodder and consequently the development of the breeding of the dromedaries by a balance of the food based on the grazing of this courses.

Mots-clés libres : NIRS, Pastoral plants, Dromedaries, Prediction, Arid and desert regions

Auteurs et affiliations

• Benrejeb M., IRA [Institut des régions arides] (TUN)
• Dbara M., IRA [Institut des régions arides] (TUN)
• Dadi K., IRA [Institut des régions arides] (TUN)
• Bonnal Laurent, CIRAD-ES-UMR SELMET (FRA) ORCID: 0000-0001-5038-7432
• Hajji H., IRA [Institut des régions arides] (TUN)
• Khorchani T., IRA [Institut des régions arides] (TUN)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/591647/)

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