Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 59, Issue 7, Pages 3295-3305Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf1040959
Keywords
authentication; beef; stable isotope ratio analysis; diet; muscle; tail hair
Funding
- Irish Department of Agriculture, Fisheries and Food
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Stable isotope ratio analysis (SIRA) was used as an analytical tool to verify the preslaughter diet of beef cattle. Muscle and tail hair samples were collected from animals fed either pasture (P), a barley-based concentrate (C), silage followed by pasture (SiP), or silage followed by pasture with concentrate (SiPC) for 1 year (n = 25 animals per treatment). The C-13/C-12, N-15/N-14, H-2/H-1, and S-34/S-32 isotope ratios in muscle clearly reflected those of the diets consumed by the animals. By applying a stepwise canonical discriminant analysis, a good discrimination of bovine meat according to dietary regimen was obtained. On the basis of the classification success rate, the C-13/C-12 and S-34/S-32 ratios in muscle were the best indicators for authentication of beef from animals consuming the different diets. Analysis of C-13/C-12 and N-15/N-14 in tail hair sections provided an archival record of changes to the diet of the cattle for periods of over 1 year preslaughter.
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