title: Comparison of visible and near infrared reflectance spectroscopy to discriminate between pasture-fed and concentrate-fed lamb carcasses.
abstract: We compared visible and near infrared spectroscopy to distinguish pasture-fed (P) from stall concentrate-fed (S) lamb carcasses. A total of 120 P and 139 S lambs were used. The reflectance spectrum of perirenal fat was measured at wavelengths between 400 and 700nm using a portable spectrophotometer, and at wavelengths between 400 and 2500nm using a laboratory monochromator NIRSystem. In method W(450-510), the reflectance data were used at wavelengths between 450 and 510nm. In methods W(400-700) and W(400-2500), a multivariate analysis was performed over the full set of reflectance data, at wavelengths in the range 400-700nm and 400-2500nm, respectively. The proportion of correctly classified P lambs was 89.1%, 90.8% and 97.5% for W(450-510), W(400-700) and W(400-2500,)W(400-2500) performing best. The proportion of correctly classified S lambs was not significantly different between methods (98.6%, 98.6% and 97.8% for W(450-510), W(400-700) and W(400-2500), respectively).
authors: Institut National de la Recherche Agronomique, INRA, UR1213 Herbivores, Site de Theix, F-63122 Saint-Genès-Champanelle, France.
authors: P H M
authors: PH
authors: Dian
authors: D
authors: D
authors: Andueza
authors: M
authors: M
authors: Jestin
authors: I N
authors: IN
authors: Prado
authors: S
authors: S
authors: Prache