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Lipid profile of commercial beef cuts from grazing, suckling calves

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Author(s): Vera, Raúl R. | English, Patti | Vargas, Karin | Briones, Ignacio

Journal: Grasas y Aceites
ISSN 0017-3495

Volume: 60;
Issue: 5;
Start page: 484;
Date: 2009;
Original page

Keywords: Beef cuts | Calves | Fatty acid | Lipid profile | Ácidos grasos | Cortes de carne | Lípidos | Terneros

ABSTRACT
The objective of the present research was to determine the contents of fat, cholesterol and fatty acids of eight beef cuts from unsupplemented, suckling, 7-8 month old male and female calves reared on permanent pastures in the VIIth Region of Chile by small cattle producers. A total of 54 animals with a mean carcass weight of 150 ± 22 kg were slaughtered in a commercial abattoir on three different dates during the month of March, 2008. Five samples of each of eight cuts were collected at random as they exited the abattoir, cooled and packed following industry practices. Beef cuts were selected based on an earlier, unreplicated analysis of 21 common cuts, to represent a wide range of cuts currently available to consumers. Large and significant differences were observed in fat content with a mean of 2.12%, ranging between 4.23% for sirloin strip and 0.68% for butcher’s roast. The cholesterol content did not differ between cuts (mean 44.7 mg/100 mg meat) and was unrelated to fat percentage. A stringent discriminant analysis of the fatty acid profiles detected highly significant differences between cuts and correctly classified 37 of the 40 samples. The n6:n3 ratio did not differ between cuts and ranged between 1.9 for sirloin strip and 2.6 for rib roast and silverside’s end. Significant differences between cuts were detected for most fatty acids, and for the atherogenicity index. Nevertheless, the latter only varied between 0.60 and 1.07 for topside and sirloin strip respectively. The results are compared with literature values. Notwithstanding differences between cuts, all beef samples were lean and had lipid profiles compatible with human health as part of a balanced diet.El objetivo del trabajo fue determinar el contenido de grasa, colesterol y perfil de ácidos grasos de ocho cortes provenientes de terneros lactantes, de 7-8 meses de edad y engordados en prados permanentes de la VII Region de Chile, por productores pequeños. Se sacrificaron 54 animales en tres fechas diferentes de Marzo de 2008, con un peso medio de canal de 150±22 kg. Se obtuvieron cinco muestras al azar de cada corte a medida que salían de la planta procesadora, las que fueron enfriadas y empaquetadas siguiendo el protocolo industrial. Los cortes fueron seleccionados en base a un análisis no replicado anterior de 21 cortes comúnmente disponibles en el mercado. Se encontraron diferencias significativas y considerables en el contenido de grasa, con una media de 2,12% y rango de 4,23 para lomo liso y 0,68% para asado abastero. El contenido medio de colesterol fue de 44,7 mg/100 g de carne, sin diferencias significativas entre cortes. Un análisis discriminante exigente detectó diferencias altamente significativas en el perfil de ácidos grasos, y clasificó correctamente a 37 de las 40 muestras analizadas. La relación n6:n3 no difirió entre cortes y osciló entre 1,9 para lomo liso y 2,6 para sobrecostilla y punta de ganso respectivamente. Se encontraron diferencias significativas para la mayoría de los ácidos grasos y para el índice de aterogenicidad. Sin embargo este último osciló sólo entre 0,60 y 1,07 para posta negra y lomo liso respectivamente. Los resultados son comparados con valores informados en la literatura. A pesar de las diferencias halladas entre cortes, todos fueron magros y tuvieron perfiles lipídicos compatibles con la salud humana, en dietas balanceadas.

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