“…On the other hand, although there is no official traceability system in the poultry production chain, mass spectrometry has been used successfully, through the carbon-13 isotopic ratio analysis, to test the authenticity, quality, and geographical origin of several products, such as fruit juice (Bricout and Koziet, 1987;Koziet et al, 1993), wine (Martin et al, 1988), honey (Brookes et al, 1991;White et al, 1998), dairy products (Rossmann et al, 2000;Manca et al, 2001), vegetal oils (Kelly et al, 1997), and the characterization and differentiation of the diet regimen of Iberian swines (González-Martin et al, 1999), certification of geographical origin, types of sheep feeding (Piasentier et al, 2003), traceability of bovine meat and bone meal in broiler feed (Carrijo et al, 2006), poultry offal meal in quail and broiler feed (Móri et al, 2007(Móri et al, , 2008Oliveira et al, 2010), poultry offal meal with yeast and wheat meal in broiler feed , and bovine meat and bone meal in the feed of laying hens (Denadai et al, 2009). This allows for the classification of animals according to the type of feed during the breeding period.…”