Effect of a-tocopherol tissue levels on beef quality.

To evaluate meat quality of beef with different ?-tocopherol tissue levels, 55 feedlot steers were fed a barley-based finisher diet with four vitamin E supplementation levels (0, 350, 700 and 1400 IU DL-?-tocopheryl acetate/animal per day) for 120 days. Although the increase in oxidation levels overtime was much smaller (P < 0.001) in the high-medium and high groups, ?-tocopherol tissue levels did not affect (P > 0.05) pH, proximate analysis, drip and cooking losses, and shear force of steaks. No effect of ?-tocopherol tissue levels was found in retail evaluation of steaks after a short ageing time of 6 days, but with 21 days of ageing, a delay in formation of metmyoglobin (P = 0.008) was observed in steaks with higher tissue levels of ?-tocopherol. Similar results were found for ground beef (25% fat) prepared from 6-day aged meat. Thus, higher ?-tocopherol tissue levels protect ground beef and long-aged steaks from discolouration and lipid oxidation.

Bibliographic Details

Main Authors:	NASSU, R. T., DUGAN, M. E. R., JUÁREZ, M., BASARAB, J. A., BARON, V. S., AALHUS, J. L.
Other Authors:	RENATA TIEKO NASSU, CPPSE; M. E. R. DUGAN, Agriculture and Agri-Food Canada, Lacombe Research Centre; M. JUÁREZ, Agriculture and Agri-Food Canada, Lacombe Research Centre; J. A. BASARAB, Alberta Agriculture and Rural Development, Lacombe Research Centre; V. S. BARON, Agriculture and Agri-Food Canada, Lacombe Research Centre; J. L. AALHUS, Agriculture and Agri-Food Canada, Lacombe Research Centre.
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2011-08-23
Subjects:	Ageing, Tenderness, beef, vitamin E,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/898506
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