Nitrogen stable isotope and carotenoid pigments signatures in the meat as tools to trace back the diet: comparsion between two sheep breeds
2017
Prache, Sophie | Graulet, Benoit | Andueza, Donato | Macari, Stefani
We compared the response of two dietary biomarkers (nitrogen stable isotope and carotenoid pigments signaturesin lamb meat) in two sheep breeds when fed two dietary lucerne levels, and we deduct subsequentimplications for diet authentication issues. Two breeds (Limousine and Romane) and two daily dietary lucernelevels (H: High, 500 g; L: Low, 0 g) were used for 60 days pre-slaughter. Treatment H comprised 35 lambs ofeach breed, individually penned and fed. Treatment L comprised 8 lambs of each breed, fed in groups. The δ15Nvalue of the muscle did not differ between breeds and gave a correct classification score of 92.9% comparinglambs from both feeding treatments. The absolute value of the mean integral of perirenal fat reflectance spectrum,which quantifies light absorption by carotenoid pigments present in perirenal fat, and plasma carotenoidcontent were similar in L Romane and L Limousine lambs, but were higher in H Romane lambs than in HLimousine lambs As the carotenoid pigments are highly involved in the discrimination process between pasturefedlambs and concentrate-fed lambs using visible spectroscopy on the fat, further work is required to test theextent to which this between-breed variability may modulate the reliability of pasture-feeding authenticationusing visible spectroscopy of the fat over a range of breeds.
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