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DOI: https://doi.org/10.5713/ajas.20.0224    [Accepted] Published online August 21, 2020.
The effect of a finishing diet supplemented with γ-aminobutyric acids on carcass characteristics and meat quality of Hanwoo steers
Farouq Heidar Barido1  , Chang Woo Lee2  , Yeon Soo Park2  , Do Yeong Kim1  , Sung Ki Lee1,* 
1Department of Applied Animal Science, College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Korea
2Gangwon Province Livestock Research Institute, Hoengseong 25266, Korea
Correspondence:  Sung Ki Lee, Tel: +82-33-250-8646, Fax: +82-33-259-5574, Email: skilee@kangwon.ac.kr
Received: 13 April 2020   • Revised: 26 May 2020   • Accepted: 3 July 2020
Investigate the effects of supplementation with rumen-protected γ-aminobutyric acid on carcass characteristics and meat quality of Hanwoo steers.
Eighteen Hanwoo steers with an average initial weight of 644.83±12.91 kg were randomly allocated into three different groups. Each group consisted of 6 animals that were treated with different diets formulated based on the animals’ body weights. The control (C) group was fed a basal diet consisting of concentrate and rice straw with 74% total digestible nutrients (TDNs) and 12% crude protein (CP). The two other groups were treatment groups; one group was fed a basal diet (74% TDNs and 12% CP) supplemented with rumen-protected γ-aminobutyric acid (GABA) at a dose of 150 mg/kg feed, and the other group was fed a basal diet (74% TDNs and 12% CP) supplemented with γ-aminobutyric acid (GABA) at a dose of 300 mg/kg feed.
GABA supplementation significantly contributed to better growth performance (p<0.05), especially the weight gain and average daily gain. It also contributed to the lower cooking loss (p<0.05), improvements in essential antioxidant enzymes and stable regulation of antioxidant activities in the longissimus lumborum of Hanwoo steers, as represented by the lower formation of malondialdehyde content within the meat, the inhibition of myoglobin oxidation indicated by the retention of the oxymyoglobin percentage, and the suppression of metmyoglobin percentage during cold storage(p<0.05).
Higher doses of GABA may not significantly promote better animal performance and meat quality, suggesting that dietary supplementation with GABA at a dose of 100 ppm is sufficient to improve the meat quality of Hanwoo steers.
Keywords: γ-Aminobutyric Acid (GABA); Supplementation; Meat Quality; Hanwoo Steers

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