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Comparison of meat quality, fatty acid composition and aroma volatiles of dry-aged beef from Hanwoo cows slaughtered at 60 or 80 months old

  • Utama, Dicky Tri (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University) ;
  • Kim, Yeong Jong (Nutritional Resource Research Institute) ;
  • Jeong, Hae Seong (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University) ;
  • Kim, Juntae (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University) ;
  • Barido, Farouq Heidar (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University) ;
  • Lee, Sung Ki (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University)
  • Received : 2019.03.12
  • Accepted : 2019.06.07
  • Published : 2020.01.01

Abstract

Objective: The objective of this study was to compare the quality of dry-aged beef from cull Hanwoo cows slaughtered at 60 or 80 months old. Methods: A total of eight cull Hanwoo carcasses with a quality grade of 3 (low-grade) were selected and divided into two age groups: 63.5±2.5 months old (n = 4) and 87.8±4.5 months old (n = 4). Whole longissimus thoracis et lumborum from the 11th rib to the last lumbar vertebrae, including the back fat, was removed from the carcass at 24 h postmortem and aged for 50 days in darkness at a temperature of 2℃±1℃, a relative humidity of 85% and an air flow of 2 m/s. The sampling was performed aseptically after 0, 20, 24, 40, and 50 days of aging. Results: Regardless of the aging period, aging increased the lightness (p<0.05), redness (p<0.05) and yellowness (p<0.05) at initial blooming (90 min after slicing) and the overall acceptance (p<0.05). No further tenderization effect was found after 20 days of aging, but aging for 50 days significantly increased the lipid oxidation (p<0.05). The generation of aroma volatiles in the roast steak from aged samples was higher (p<0.05) than that of non-aged samples. No significant effect of age at slaughter was found on the color, pH, water-holding capacity, cooking loss, shear force value, bacterial counts, volatile basic nitrogen, consumer acceptance, lipid oxidation, fatty acid composition or aroma volatiles. Conclusion: The quality of dry-aged beef obtained from cull Hanwoo cows slaughtered at either 60 or 80 months old with similar quality grade was comparable and extending dry aging for more than 40 days is not recommended considering the costs and further lipid oxidation.

Acknowledgement

Supported by : Kangwon National University

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