The combined effects of time on feed, electrical stimulation and aging on beef quality

Two experiments were conducted to determine the combined effects of time on feed, high-voltage electrical stimulation (HVES) and postmortem aging on beef quality and palatability. Increasing time on feed resulted in an increase in carcass fat thickness, dressed carcass weight and marbling and a decrease in carcass lean content, carcass shrinkage and shear values in both experiments. Steaks from longer-fed animals were rated more highly for juiciness, tenderness and overall palatability by the consumers polled. HVES lowered muscle pH (3, 24 and 144 h), increased subjectively appraised marbling fat, gave brighter, redder muscle colour up to 6 d postmortem, and improved consumer ratings for flavour, juiciness, tenderness and overall palatability. HVES also resulted in a significant improvement in shear values (shear values were decreased by 27 and 35% in experiments 1 and 2, respectively). Aging for 6 d improved meat colour, decreased the amount of expressible juice and lowered the shear value of steaks by 11 and 9% respectively, in experiments 1 and 2. A consumer survey indicated that more than 20% of steaks were rated as unacceptable for tenderness when time on feed and postmortem aging were similar to Canadian beef-production practices. Incorporation of HVES as a means of quality control would reduce the proportion of unacceptable steaks to approximately 10%. Key words: Beef quality, time on feed, electrical stimulation, aging

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EFFECTS OF A LOW-VOLTAGE RECTAL ELECTRODE SYSTEM ON BEEF QUALITY FROM YOUNG AND MATURE COWS

Canadian Journal of Animal Science ◽

10.4141/cjas87-072 ◽

1987 ◽

Vol 67 (3) ◽

pp. 689-704 ◽

Cited By ~ 2

Author(s):

Z. J. HAWRYSH ◽

F. H. WOLFE

Keyword(s):

Electrical Stimulation ◽

Low Voltage ◽

Biceps Femoris ◽

Electrode System ◽

Eating Quality ◽

Beef Quality ◽

Young Control ◽

Muscle Ph ◽

Postmortem Aging

The quality characteristics of biceps femoris (BF), longissimus (L) and pectoralis profundis (PP) roasts obtained from young and mature cow carcasses subjected to low voltage (110 V) electrical stimulation (ES) were determined. ES was applied with a steel busbar rectal probe for 2 min. Evaluations were conducted on meat obtained from young control sides (no ES) aged 48 h, from young and mature sides (no ES) aged 6 d and from young and mature ES sides aged 48 h. ES caused a reduction (P < 0.001) in BF muscle pH at 1 and 4 h postmortem. Except for the pH differences in L muscle of young cows at 24 h, there were no differences in L muscle pH values due to ES for either young or mature cows. At 24 h, the pH of muscles from all carcasses was about 5.6. Cooking losses did not appear to be affected by either ES or increased aging in young control roasts. For both young and mature BF and L roasts, trained panelists generally did not detect significant effects due to ES. Except for differences in OTMS-Warner Bratzler shear values for mature PP samples, objective measurements for all roasts show no significant effects due to ES. Thus, no differences in cooking and eating quality of BF, L and PP roasts were found due to the application of low-voltage ES via the busbar rectal probe. Increasing postmortem aging time from 48 h to 6 d for young control carcasses did not influence roast quality. Animal maturity had some significant effects on the quality of all roasts. Key words: Low-voltage electrical stimulation, beef quality

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International significance of Australian research on beef quality - a view from the periphery

Australian Journal of Experimental Agriculture ◽

10.1071/ea01004 ◽

2001 ◽

Vol 41 (7) ◽

pp. 1089 ◽

Cited By ~ 3

Author(s):

C. E. Devine

Keyword(s):

Research Effort ◽

Agricultural Products ◽

Beef Quality ◽

Beef Industry ◽

Significant Component ◽

Large Numbers ◽

Current Thinking ◽

Australian Climate ◽

The World ◽

Production Practices

Australia produces agricultural products, including meat, as major items for export as well as being consumed locally. It is no accident that Australia is one of the major exporters of meat to distant markets and the success is predicated on adapting animal production practices and processing to produce a highly desirable product that is safe to eat. Research plays a large part in this strategy, but one would have to say that for some time the view that ‘a prophet hath no honour in his own country’ has predominated. The Cattle and Beef CRC is designed to improve the profitability of the Australian beef industry by bringing in partners, some of whom were prominent in previous research endeavours to coordinate a research effort in order to benefit the whole industry — it is a unique and effective approach. It has taken some time to demonstrate that a ‘nice’ looking animal is not a predictor of meat quality — rather it needs to be processed correctly in order for it to meet the most critical consumer requirements. The researchers in Australia have in fact been the world leaders in advocating procedures such as electrical stimulation that have been taken up by the industry. There are still areas where the research results from Australia differ from that in other countries. CRC-based research in Australia in controlled studies using large numbers of animals with a wide genetic base, has shown that both cattle with a significant component from tropical genotypes and non-tropical genotypes, processed correctly, produce highly acceptable meat. To get further improvements, we merely need to identify the causes of outliers and this should not be difficult. This concept is of course important in the context of the relatively dry Australian climate that results in different problems from other countries. One important outcome of the CRC has been to show that sectors of the industry need to work together to use research and, if necessary, challenge current thinking imposed from outside. In other words, Australians should believe in themselves.

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