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Objective. To assess the fatty acids composition (FA) in Wagyu beef and its crosses with Angus, Beefmaster, Brangus and Hereford, and to analyze its relationship with genetic markers related to lipid metabolism. Materials and methods. 111 Longissimus dorsi samples were collected and grouped by genetic group. FA were extracted and quantified in a gas-liquid chromatography and DNA markers theoretically associated to FA were typed. Hardy-Weinberg equilibrium and linkage disequilibrium were examined, the effect of crosses and the effect of genotypes were estimated. Results. The crosses did not show substantial differences in FA composition. Nine SNPs showed association with FA composition, and a significant effect was found in the SLC2A4 marker ss62538460 which influenced SFA, MUFA and MUFA/SFA; PLTP ss77832104 and IGF2R ss77831885 markers, influenced C16:0, MYOZ1 ss77832104 on C17:1 and PPARGC1A c.1892+19 on C18:2. In addition, previously described effects of MEF2C ss38329156 and SCD c.878 were supported. Conclusions. These results are first evidence on FA deposition in Wagyu cattle and their crosses, and proposes some loci in candidate genes with the possibility of implementation in assisted selection strategies. [ABSTRACT FROM AUTHOR]

Objetive. To determine the proximal composition and profile of fatty acids (FA) in Cotinis columbica Burmeister larva collected in the municipalities of Mogotes and Garzón, Bogotá, Colombia. Materials and methods. Six samples of C. columbica Burmeister larvae were collected during three months, from the municipalities of Mogotes and Garzón, Bogotá, Colombia (3 months x 2 = 6). The samples were subjected to proximal chemical analysis and AG analysis by gas chromatography with a flame ionization detector and capillary column. Results. In mogotes, 21.2 and 23.3% of fat and protein were found, respectively, while in Garzón values of 31.1 and 25.9% were found, there was no statistical difference (p≥0.05). Chromatographic analyzes determined 18 AG, from C4:0 to C22:2, c13.16. The t-student test showed significance (p<0.05) only in C10:0; through time (May, June and July) the values were higher in Garzón larvae. The contents of saturated, monounsaturated and polyunsaturated AG groups were between 30.20 and 36.92 (% w/w). Conclusions. The proximal composition and fatty acid profile were similar, except for C10:0, in the fat of Cotinis columbica Burmeister larvae from Mogotes and Garzón, Colombia. [ABSTRACT FROM AUTHOR]

It presents a review about the composition, structure and mechanism of milk fat synthesis in the bovine mammary gland, and about the effect of unsaturated fatty acid (UFA) supplementation on the amount and quality of milk fat. It is enhanced the importance of the supplementation with vegetable plus fish oils; it is suggested that the effect of UFA should not be remarked as negative on the amount of milk fat; It is showed the necessity of relating different UFA with the SREBP's regulatory way, and with different lipid enzymes; and it is promoted research about the effect of UFA on the milk fatty acid composition and their positional distribution into the lipid structure. [ABSTRACT FROM AUTHOR]