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Utilice este identificador para citar o enlazar este documento: https://ria.asturias.es/RIA/handle/123456789/13045


Título: Length of concentrate finishing affects the fatty acid composition of grass-fed and genetically lean beef: an emphasis on trans-18:1 and conjugated linoleic acid profiles
Autores: Aldai, Noelia
Dugan, M. E. R.
Kramer, J. K. G.
Martínez, Adela
López Campos, Óscar
Ruiz Mantecón, Ángel
Osoro, Koldo
Palabras Claves: Carne de vaca
Ácido linoléico
CLA
Ácido vaccénico
Calidad de la carne
Fecha Edición: 26-Abr-2011
Editor: Cambnridge University Press
Cita Bibliográfica: Aldai, N., Dugan, M. E. R., Kramer, J. K. G., Martinez, A., Lopez-Campos, O., Mantecon, A. R. & Osoro, K. Length of concentrate finishing affects the fatty acid composition of grass-fed and genetically lean beef: an emphasis on trans-18:1 and conjugated linoleic acid profiles. Animal. 2011; 5 (10): 1643-1652.
Resumen: Intensively finishing cattle on a high-grain diet is generally used to enhance marbling, whereas extensively finishing on grass is known to provide improved muscle fatty acid profiles. The objective of this study was to evaluate to what extent intensive concentrate finishing (0, 1 or 2 months) can be combined with forage feeding without negatively affecting the fatty acid profile of genetically lean animals. Bulls from the 'Asturiana de los Valles' breed were reared under grazing conditions with/without final finishing on a barley-based concentrate: 0 months (control; n = 7), 1 month (n = 10) and 2 months (n = 57). Yearling bulls were slaughtered commercially at an average live weight of 516 +/- 9.8 kg. Increasing the finishing time on concentrate significantly increased the saturated and monounsaturated fatty acids, whereas polyunsaturated fatty acids (PUFAs) tended to decrease and it was not possible to increase the long-chain PUFA content in muscle tissue of this breed. An increase was observed for total trans-18:1 (average 5.5% with grain v. 3.7% for grass). The 11t-18:1/10t-18:1 ratio was significantly higher in grass-fed (average 8.1) compared with grain-finished animals (average 1.1). Grass or limited concentrate finishing reduced the n-6/n-3 ratio in muscle tissue (average 3.6 for 0 and 1 month, and 4.9 for 2 months on grain finishing). The beef was within or close to the recommended values for human consumption (i.e. polyunsaturated/saturated > 0.45, n-6/n-3 < 4.0), and total trans-FA content was low. However, finishing increased the content of undesirable trans-18:1 and conjugated linoleic acid isomers, particularly after judged fatty
URI: https://ria.asturias.es/RIA/handle/123456789/13045
ISBN: 1751-7311
Aparece en las Colecciones:Open Access DRIVERset
Agroalimentación y Ganadería

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