Please use this identifier to cite or link to this item:
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
Autor : Aldai, Noelia, Dugan, M. E. R., Kramer, J. K. G., Martínez, A., López Campos, Oscar, Mantecón, Ángel R., Osoro, Koldo
Palabras clave : Beef
Vaccenic acid
Fecha de publicación : 2011
Editor: Cambridge University Press
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 2 months, whereas grass finishing was judged to provide a healthier beef fatty acid profile.
Descripción : 10 páginas, 7 tablas, 2 figuras.
Versión del editor:
ISSN: 1751-7311
Fecha de embargo: 2012-10-01
Citación : Animal 5 (10) : 1643-1652 (2011)
Appears in Collections:(IGM) Artículos

Files in This Item:
File Description SizeFormat 
Aldai, N. Animal 2011.pdf167,97 kBAdobe PDFView/Open
Show full item record

Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.