"Global" and "local" predictions of dairy diet nutritional quality using near infrared reflectance spectroscopy

Tran H., Salgado Paulo, Tillard Emmanuel, Dardenne Pierre, Nguyen X.T., Lecomte Philippe. 2010. "Global" and "local" predictions of dairy diet nutritional quality using near infrared reflectance spectroscopy. Journal of Dairy Science, 93 (10) : pp. 4961-4975.

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Abstract : The objective of the study was to evaluate performance of classic (global) and innovative (local) calibration techniques to monitor cattle diet, based on fecal near infrared reflectance spectroscopy (NIRS). A 3-yr on-farm survey (2005-2008) was carried out in Vietnam and La Reunion Island to collect animal, feed intake, and feces excretion data. Feed and feces were scanned by a Foss NIRsystem 5000 monochromator (Foss, Hillerød, Denmark) to estimate diet characteristics and nutrient digestibility. A data set including 1,322 diet-fecal pairs was built and used to perform global and local calibrations. Global equations gave satisfactory accuracy [coefficient of determination (R2) >0.8, 10% ? relative standard error of prediction (RSEP) ?20%], whereas local equations gave good accuracy (R2 >0.8, RSEP <10%) or excellent accuracy (R2 >0.9, RSEP <10%) for the prediction of diet intake, quality, and digestibility. When validating the equations using the external individual data, both techniques were robust, with similar RSEP (8%) and R2 (0.82) values. The predictive performance of global and local equations was improved (RSEP = 5% and R2 = 0.90) when averaged animal data from farm, visit, and similar milk production were used. In particular, local equations reduced RSEP by 43% and increased R2 by 15%, on average, compared with those obtained from individual data. The low RSEP (4%), high R2 (0.96), and good ratio performance deviation (RPD = 5) illustrated the excellent accuracy and robustness of the local equations. Findings suggest the ability of fecal NIRS to successfully and more accurately predict diet properties (intake, quality, and digestibility) with local calibration techniques compared with classic global techniques, especially on an averaged data set. Local calibration techniques represent an alternative promising method and potentially a decision support tool to decide whether diets meet dairy cattle requirements or need to be modified. (Résumé d'auteur)

Mots-clés Agrovoc : Bovin laitier, Régime alimentaire, Aliment pour animaux, Qualité, Valeur nutritive, Alimentation des animaux, Enquête sur exploitations agricoles, Fèces, Composition chimique, technique de prévision, Spectroscopie infrarouge

Mots-clés géographiques Agrovoc : Viet Nam, Réunion

Classification Agris : L02 - Animal feeding
L51 - Animal physiology - Nutrition
Q54 - Feed composition
U30 - Research methods

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Tran H., Hanoï University of Agriculture (VNM)
  • Salgado Paulo, CIRAD-ES-UPR Systèmes d'élevage (FRA)
  • Tillard Emmanuel, CIRAD-PERSYST-UMR ERRC (REU)
  • Dardenne Pierre, CRA (BEL)
  • Nguyen X.T., Hanoï University of Agriculture (VNM)
  • Lecomte Philippe, CIRAD-ES-UPR Systèmes d'élevage (REU) ORCID: 0000-0003-1040-7886

Source : Cirad - Agritrop (

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