Multielement (H, C, N, O, S) stable isotope characteristics of lamb meat from different Italian regions.
The study focuses on the (2)H/H, (13)C/(12)C, (15)N/(14)N, (18)O/(16)O and (34)S/(32)S values of defatted dry matter (DFDM) and on the (2)H/H, (13)C/(12)C and (18)O/(16)O values of the fat fraction of meat samples from various lamb types reared in seven Italian regions, following different feeding regimes (forage, concentrate, milk). The (13)C/(12)C (r = 0.922), (2)H/H (r = 0.577) and (18)O/(16)O (r = 0.449) values of fat and DFDM are significantly correlated, the fat values being significantly lower for C and H and higher for O than for DFDM values and the differences between the two fractions not being constant for different lamb types. The feeding regime significantly affected the (13)C/(12)C, (15)N/(14)N, (18)O/(16)O and (2)H/H of fat. The DFDM (2)H/H, and (18)O/(16)O values, excluding an outlier, are significantly correlated with the corresponding values in meteoric waters, thus allowing us to trace the variability of geoclimatic factors. (15)N/(14)N is influenced by pedoclimatic conditions, whereas (34)S/(32)S is influenced by the sea spray effect and the surface geology of the provenance area. By applying stepwise linear discriminant analysis only the (2)H/H of fat was found not to be significant and 97.7% of the samples were correctly assigned to the lamb type and more than 90% cross-validated. With the feeding regime, 97.7% of the samples were both correctly assigned and cross-validated using a predictive model including (13)C/(12)C, (15)N/(14)N, (18)O/(16)O, (34)S/(32)S of DFDM and (18)O/(16)O of fat.
Perini
Matteo
M
FEM-IASMA Research Centre, Agrifood Quality Department, via E. Mach 1, 38010 San Michele all'Adige, TN, Italy.
Camin
Federica
F
Bontempo
Luana
L
Rossmann
Andreas
A
Piasentier
Edi
E
D000821:Animal Feed / Q000032:analysis; D000818:Animals; D002247:Carbon Isotopes / Q000032:analysis*; D003903:Deuterium / Q000032:analysis*; D005223:Fats / Q000032:analysis; D007558:Italy; D008460:Meat / Q000032:analysis*; D009587:Nitrogen Isotopes / Q000032:analysis*; D010103:Oxygen Isotopes / Q000032:analysis*; D012756:Sheep; D013460:Sulfur Isotopes / Q000032:analysis*
D002247:Carbon Isotopes; D005223:Fats; D009587:Nitrogen Isotopes; D010103:Oxygen Isotopes; D013460:Sulfur Isotopes; D003903:Deuterium