• Follow us

Global an local predictions of dairy diet nutritional quality using near infrared reflectance spectropscopy


  • Tran, H. , Salgado, P. , Tillard, E. , Dardenne, P. , Ngueyen, X. & Lecomte, P. (2010). Global an local predictions of dairy diet nutritional quality using near infrared reflectance spectropscopy. J. Dairy Sci. 93: 4961-4975.
Type Journal Article
Year 2010
Title Global an local predictions of dairy diet nutritional quality using near infrared reflectance spectropscopy
Journal J. Dairy Sci.
Label U15-1520
Recnumber 677
Volume 93
Pages 4961-4975
Date 2010
Endnote Keywords dairy diet|near infrared reflectance spectroscopy|quality|prediction|
Abstract 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, Hillerod, 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.
Author address Dardenne Pierre, Quality Department of Agro-food Products, Walloon Agricultural Research Centre (CRA-W), Chaussée de Namur, 24, B-5030 Gembloux, dardenne@cra.wallonie.be
File Global an local predictions of dairy diet nutritional quality using near infrared reflectance spectropscopy
Caption U15-1520-dardenne-2010.pdf
Link http://dx.doi.org/10.3168/jds.2008-1893
Authors Tran, H. , Salgado, P. , Tillard, E. , Dardenne, P. , Ngueyen, X. & Lecomte, P.