| "Global" and "local" predictions of dairy diet nutritional quality using near infrared reflectance spectroscopy. | |
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MedLine Citation:
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PMID: 20855031 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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 (R(2)) >0.8, 10% ≤ relative standard error of prediction (RSEP) ≤20%], whereas local equations gave good accuracy (R(2) >0.8, RSEP <10%) or excellent accuracy (R(2) >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 R(2) (0.82) values. The predictive performance of global and local equations was improved (RSEP = 5% and R(2)=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 R(2) by 15%, on average, compared with those obtained from individual data. The low RSEP (4%), high R(2) (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. |
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Authors:
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H Tran; P Salgado; E Tillard; P Dardenne; X T Nguyen; P Lecomte |
Publication Detail:
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Type: Comparative Study; Evaluation Studies; Journal Article |
Journal Detail:
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Title: Journal of dairy science Volume: 93 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-09-21 Completed Date: 2010-12-30 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
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Languages: eng Pagination: 4961-75 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 American Dairy Science Association. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Faculty of Animal Sciences and Aquaculture, Hanoi University of Agriculture, Vietnam. hiep26@yahoo.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed
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standards* Animal Nutritional Physiological Phenomena Animals Calibration Cattle Diet / standards, veterinary* Feces / chemistry* France Nutritive Value Quality Control Reproducibility of Results Spectroscopy, Near-Infrared / methods, veterinary* Vietnam |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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