Diet and Genotype Effects on n-3 Polyunsaturated Fatty Acids of Beef Lipids

Pilar Teresa García, Nestor Latimori, Ana Maria Sancho, Jorge José Casal


The aim of this study was to study the effects of four feeding systems on n-3 Polyunsaturated Fatty Acids (PUFAs) in Longissimus dorsi muscle lipids from three different steer genotypes and discuss the current finding concerning the role of these factors on alfa-linolenic acid conversion into n-3 long chain PUFAs. The feeding systems described here, represent productive models widespread in Argentina Pampeana region, ranging from pasture exclusive diet, to the feedlot system. C18:2 n-6 (LA) increased whereas C18:3 n-3 (ALA) decreased according to the increase in grain in the diet. The LA/ALA and n-6/n-3 PUFAs ratios increased as the grain in the diet increased. We concluded that by feeding animals correctly, we address the problem of consuming a high n-6/n-3 PUFAs ratio without virtually changing normal diets. Although these changes appear modest, for non-sea fish eaters, animal products such as beef are the only sources of long-chain n-3 PUFAs, and any improvement in the fatty acid composition of beef will result in an increase in the consumption of n-3 fatty acids.

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