Effect of weaning status on lipids of Galician Blond veal: Total fatty acids and 18:1 cis and trans isomers

The effect of weaning at different ages (NW = not weaned, W5 = 5.5 months and W2 = 2 months) on fatty acids (FA) of the Longissimus thoracis (LT) muscle was studied in 36 Galician Blond (GB) calves. Total FA (TFA) were determined by gas chromatography (GC) and 18:1 isomers by a combination of reversed-phase high performance liquid chromatography (HPLC) and GC. NW group showed higher (P < 0.001) values of n-3 polyunsaturated FA (PUFA), conjugated linoleic acid (CLA) and 18:1trans-11 compared to LT from W5 and W2 calves. W2 calves showed the highest levels of n-6 PUFA (P < 0.01), 18:1trans-10 and 18:1trans-6/7/8 (P < 0.001). Generally, W5 calves had intermediate values for TFA and 18:1 isomers. As the suckling period was longer, GB milk and veal FA profiles became more similar, it seems that muscle FA were partially transmitted by the milk FA intake due to the persistence of the reticular grove closing reflex.