Changes in molecular species composition of triacylglycerol in subcutaneous fat from beef cattle during fattening

Abstract

The composition of the molecular species of triacylglycerols (TG) in subcutaneous fat biopsied from Japanese Black steers was studied during the fattening period. An analysis of the fatty acid (FA) composition of the TG showed that palmitic, palmitoleic, stearic and oleic acids were the major FA, together accounting for over 80% of the total FA. The concentrations of C14:0, C16:0 and C18:0 decreased between 10 and 30 months of age, while those of C16:1 c9 and C18:1 c9 increased during the fattening period. The major molecular species among more than 40 compounds were palmitoyl‐dioleoyl‐glycerol (POO) and dipalmitoyl‐oleoyl‐glycerol (PPO). POO showed the highest concentration during the fattening period. The levels of palmitoyl‐oleoyl‐linoleoyl glycerol and some tentatively identified molecular species increased during the fattening period, while the levels of tripalmitoyl, dipalmitoyl‐stearoyl‐glycerol, palmitoyl‐distearoyl and palmitoyl‐stearoyl‐oleoyl‐glycerol decreased with growth. A comparison of the experimental values of TG molecular species with theoretical values derived from the experimental FA contents showed that the FA distribution in TG was non‐random. TG synthesis favors the formation of TG molecular species containing at least one C16 FA, rather than three C18 FA.

Identification and utilization of genes associated with beef qualities

“…1991; Chang et al . 1992; Suzuki et al . 2007), these results suggested that fatty acid composition could be controlled by genetic factors such as lipid synthesis and fatty acid metabolism‐related genes.…”

Effect of SCD and SREBP genotypes on fatty acid composition in adipose tissue of Japanese Black cattle herds

“…1991; Chang et al. 1992; Suzuki et al. 2007), it has been reported that genetic factors in part regulate fatty acid composition, with regards to a mechanism of fatty acid metabolism (Horton et al.…”

“…In addition to various environmental effects (Huerta-Leidenz et al 1991;Chang et al 1992;Suzuki et al 2007), it has been reported that genetic factors in part regulate fatty acid composition, with regards to a mechanism of fatty acid metabolism (Horton et al 2002). Stearoyl-CoA desaturase (SCD) is an enzyme that catalyzes the D9 desaturation of saturated fatty acids (SFAs) to MUFAs.…”

Genes Associated with Fatty Acid Composition of Beef

“…Oka et al (2002) demonstrated that sire groups had a significant effect on the fatty acid composition of Japanese Black cattle. In addition to various environmental effects (HuertaLeidenz et al, 1991;Chang et al, 1992;Suzuki et al, 2007), these results suggest that fatty acid composition could be controlled by genetic factors such as lipid synthesis and fatty acid metabolism-related genes.…”