The effect of finishing diet supplemented with methionine/lysine and methionine/α-tocopherol on performance, carcass traits and meat quality of Hanwoo steers

  • Barido, Farouq Heidar (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University) ;
  • Utama, Dicky Tri (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University) ;
  • 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) ;
  • Lee, Chang Woo (Gangwon Province Livestock Research Institute) ;
  • Park, Yeon Soo (Gangwon Province Livestock Research Institute) ;
  • Lee, Sung Ki (Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University)
  • Received : 2019.03.14
  • Accepted : 2019.07.03
  • Published : 2020.01.01


Objective: This study aimed to compare the effects of diets with and without supplements of methionine/lysine (met/lys) and methionine/α-tocopherol (met/α-tocopherol) on the performance, carcass traits and meat quality of Hanwoo steers. Methods: A total of 21 Hanwoo steers were divided into three different groups. Each group consisted of 7 animals that received different dietary treatments for 120 days as follows: a control (C) diet composed of a basal diet with 74% total digestible nutrient and 12% crude protein; treatment 1 (T1) composed of a basal diet enriched with methionine 69%+lysine 31%; and treatment (T2) composed of a basal diet enriched with methionine 84.65%+α-tocopherol 15.35%. Daily supplementation was given using the top-dressing method (20 g/animal). Results: The met/lys groups yielded a longissimus lumborum with increased water holding capacity (p<0.01) and lower shear force value (p<0.05). Dietary met/lys did not have an adverse effect on the animal performance and carcass traits. Instead, these supplements contributed significantly to the higher protein content compared to the control diet (p<0.05). Myristic acid (C14:0) was the only fatty acid affected by the supplementation. While the met/α-tocopherol group led to significantly higher protein and oxymyoglobin contents during storage (p<0.05). It also contributed significantly to the lower shear force value and 2-thiobarbituric acid reactive substances score during storage (p<0.05) compared to the control and treatment 1 since the initial storage day. The met/α-tocopherol diet also yielded meat with a redder color (p<0.05) after 3 days of storage. However, it did not significantly contribute to the fatty acid profiles of Hanwoo steers. Conclusion: Met/lys supplementation resulted in higher protein scores, water holding capacity and lower shear force scores. While met/α-tocopherol supplementation contributes to the production of redder meat, reduces lipid oxidation, production of more tender meat and increases the content of protein and oxymyoglobin percentage.


Supported by : Gangwon Provincial Livestock Research Institute


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