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Comparison of visible and near infrared reflectance spectroscopy on fat to authenticate dietary history of lambs

Published online by Cambridge University Press:  13 July 2015

Y. Huang ,
D. Andueza ,
L. de Oliveira ,
F. Zawadzki  and
S. Prache
Y. Huang
Affiliation:
INRA, UMR1213 Herbivores, Site de Theix, F-63122 Saint-Genès-Champanelle, France
D. Andueza
Affiliation:
INRA, UMR1213 Herbivores, Site de Theix, F-63122 Saint-Genès-Champanelle, France
L. de Oliveira
Affiliation:
INRA, UMR1213 Herbivores, Site de Theix, F-63122 Saint-Genès-Champanelle, France Universidade Federal do Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 7712, CEP 91501-970, Porto Alegre-RS, Brazil
F. Zawadzki
Affiliation:
INRA, UMR1213 Herbivores, Site de Theix, F-63122 Saint-Genès-Champanelle, France Universidade Estadual de Maringá, UEM, Av. Colombo 5.790, CEP 87020-900, Maringá-Pr, Brazil
S. Prache*
Affiliation:
INRA, UMR1213 Herbivores, Site de Theix, F-63122 Saint-Genès-Champanelle, France
*
†E-mail: sophie.prache@clermont.inra.fr
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Abstract

Since consumers are showing increased interest in the origin and method of production of their food, it is important to be able to authenticate dietary history of animals by rapid and robust methods used in the ruminant products. Promising breakthroughs have been made in the use of spectroscopic methods on fat to discriminate pasture-fed and concentrate-fed lambs. However, questions remained on their discriminatory ability in more complex feeding conditions, such as concentrate-finishing after pasture-feeding. We compared the ability of visible reflectance spectroscopy (Vis RS, wavelength range: 400 to 700 nm) with that of visible-near-infrared reflectance spectroscopy (Vis-NIR RS, wavelength range: 400 to 2500 nm) to differentiate between carcasses of lambs reared with three feeding regimes, using partial least square discriminant analysis (PLS-DA) as a classification method. The sample set comprised perirenal fat of Romane male lambs fattened at pasture (P, n=69), stall-fattened indoors on commercial concentrate and straw (S, n=55) and finished indoors with concentrate and straw for 28 days after pasture-feeding (PS, n=65). The overall correct classification rate was better for Vis-NIR RS than for Vis RS (99.0% v. 95.1%, P<0.05). Vis-NIR RS allowed a correct classification rate of 98.6%, 100.0% and 98.5% for P, S and PS lambs, respectively, whereas Vis RS allowed a correct classification rate of 98.6%, 94.5% and 92.3% for P, S and PS lambs, respectively. This study suggests the likely implication of molecules absorbing light in the non-visible part of the Vis-NIR spectra (possibly fatty acids), together with carotenoid and haem pigments, in the discrimination of the three feeding regimes.

Keywords

authenticationpasture-feedingstall-finishingNIR spectroscopysheep
Type
Research Article
Information
animal , Volume 9 , Issue 11 , November 2015 , pp. 1912 - 1920
Copyright
© The Animal Consortium 2015 

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