Effect of a grazing period prior to finishing on a high concentrate diet on meat quality from bulls and steers
2017
Moran, L. | O'Sullivan, M.G. | Kerry, J.P. | Picard, Brigitte | Mcgee, M. | O'Riordan, E.G. | Moloney, A.P. | Food Research Ctentre ; Teagasc Food Research Centre [Fermoy, Ireland] | School Food and Nutrition Science ; University College Cork (UCC) | Unité Mixte de Recherche sur les Herbivores - UMR 1213 (UMRH) ; Institut National de la Recherche Agronomique (INRA)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS) | Animal and Grassland Research an Innovation Centre ; Teagasc Food Research Centre [Fermoy, Ireland] | Irish Department of Agriculture, Food and the Marine's competitive research programmes 11/SF/322
Bulls and steers (n = 60) were assigned to a pre-finishing grazing period and subsequently finished on concentrates or offered concentrates without grazing until slaughter(19 months). Colour and pH of longissimus thoracis were measured (48 h post-slaughter), and samples collected for proximate composition, collagen, sarcomere length, muscle fibre and enzymatic profile analysis. Steaks for texture, cook loss and sensory were aged (14 days). Castration increased intramuscular fat content, cook loss and myosin isoforms IIa and I proportions, and decreased IIx proportion (P < 0.05). Steer meat was positively correlated to overall tenderness, texture and acceptability (P < 0.05). The presence of a pre-finishing grazing period decreased intramuscular fat and increased the proportion of IIa compared with animals on concentrates, while no differences were found in sensory. Muscle colour, collagen, sarcomere length and instrumental texture were not modified by diet or castration. In conclusion, beef sensory characteristics were unaffected by diet, whereas castration resulted in a small improvement; however all the treatments produced an acceptable product.
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