Meat is limited as a source of CLA and CLA contents inmeat are largely
differing among livestock species. In ruminant meat, the proportion of
PUFA biohydrogenation intermediates may reach up to 10 to 15% of
total lipids in some production systems (Aldai, Dugan, Juarez,
Martinez, & Koldo, 2010). Ruminant-source foods therefore have relatively
high concentrations of CLA (0.5 to 1.5% of total fatty acids). For
beef lipids a range between 0.1 and 1.0% CLA was reported by Schmid
et al. (2006). The RA represents 90% of CLA isomers present in milk
and 75% of CLA isomers present in beef fat (Chin, Liu, Storkson, Ha, &
Pariza, 1992). In non-ruminant animals, RA and VA have to be externally
supplied in the diet in order to be enriched in meat. Therefore, meat
from monogastric animals is a poor source of these compounds (0.1 to
0.2% CLA of total fatty acids), and fish and some vegetables also contain
low CLA concentrations (Chin et al., 1992).