Effect of prolonged heat treatments at low temperature on shear force and cooking loss in cows and young bulls.

L. Christensen, L. Andersen, Hanne Løje, P. Ertbjerg, M. Christensen

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Abstract

Long term heat treatment at low temperature (LTLT) is known to decrease toughness of meat. However, the contribution from the connective tissue to the toughness of LTLT treated meat is not clear. The aim of the present study was to investigate the effect of LTLT treatments on shear force and cooking loss in semitendinosus from cows (4-6 years) and young bulls (12-14 months), representing 2 categories of beef with varying thermal strength of connective tissue. Vacuum packed muscle samples were heat treated at 53°C, 55°C, 58°C and 63°C in water baths for 2½, 7½ and 19½ h. Cooking loss and Warner-Bratzler shear force were measured after heat treatment and subsequent cooling. Shear force of semitendinosus from young bulls heated at 53°C for 2½ h was significantly higher compared with all other heat treatments. A decrease of app. 40 N was observed when increasing the heating temperature from 53°C to 55°C, or when increasing heating time from 2½ to 7½ h at 53°C. In semitendinosus from cows shear force decreased significantly with increasing temperature, and with increasing heating time from 2½ to 19½ h at 55°C and 63°C. Cooking loss increased with increasing heating temperature in both beef categories. The results show that prolonged heating at low temperatures reduce toughness in beef semitendinosus, and that a reduction in toughness require higher temperatures and longer heating times in semitendinosus from cows compared with young bulls.
Original languageEnglish
Title of host publicationProceedings of ICoMST 2011
Publication date2011
Publication statusPublished - 2011
Event57th International Congress of Meat Science and Technology - Ghent, Belgium
Duration: 7 Aug 201112 Aug 2011
Conference number: 57
http://www.sciencedirect.com/science/journal/03091740/89/3

Conference

Conference57th International Congress of Meat Science and Technology
Number57
CountryBelgium
CityGhent
Period07/08/201112/08/2011
Internet address

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