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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.18.0853    [Accepted] Published online January 4, 2019.
Effects of feeding ethanol on growth performances, carcass characteristics, and lipid metabolism of finishing Korean cattle (Hanwoo) steers
Chang Bon Choi1,*  , Hana Kwon2, Kyung Hyun Hwang3, Hyun-Jeong Lee4, Jong Yeon Kim5
1Department of Medical Biotechnology, College of Life and Applied Sciences, Yeungnam University, Gyeongsan 38541, Korea
2Department of Food and Nutrition, Yeungnam University, Gyeongsan 38541, Korea
3Gunwi Livestock Cooperative Federation, Gunwi 39015, Korea
4Animal Nutritional Physiology Team, National Institute of Animal Sciences, Wanju 55365, Korea
5Department and Faculty of Physiology, College of Medicine, Yeungnam University, Daegu 42415, Korea
Correspondence:  Chang Bon Choi, Tel: +82-53-810-3023, Fax: +82-53-810-4769, Email: cbchoi@yu.ac.kr
Received: 14 November 2018   • Revised: 5 December 2018   • Accepted: 28 December 2018
Abstract
Objective: The purpose of this study was to determine the effects of feeding ethanol on growth performances, carcass characteristics, and lipid metabolism of finishing Korean cattle (Hanwoo) steers.

Methods

Thirty (30) Hanwoo steers (average 25.1 months of age, BW 660.1 kg) were assigned to three treatments: control (0% ethanol), E-3 (1.44% ethanol for 3 months), or E-5 (0.72% ethanol for 2 months followed by 1.44% ethanol for 3 months). The animals were allotted by treatment group into six pens and fed concentrate and perennial ryegrass. Ethanol (30%, v/v) was supplemented into drinking water twice a day to meet final concentrations based on average water consumption of finishing Hanwoo steers.

Results

There were no statistical differences among the groups in final body weight, average daily gain, or carcass yield grade indices such as cold carcass weight, fat thickness, and loin area. The marbling score tended (p = 0.228) to increase with the highest score (6.7) in the E-5 group followed by 6.3 and 6.0 in E-3 and control groups, respectively. The appearance frequencies of quality grades of 1++ (the best), 1+, 1, and 2, were; 30, 50, 0, and 20% for control, 10, 80, 10, and 0% for E-3, and 10, 80, 0 and 10% for E-5 groups, respectively, indicating improvements of quality grades by feeding ethanol. Concentrations of serum glucose tended to decrease whereas those of insulin and non-esterified fatty acid (NEFA) to increase by feeding ethanol (E-3 and E-5; p > 0.05).
Conclusion
Feeding ethanol directly into drinking water of finishing Hanwoo steers stimulated lipogenesis in intramuscular adipose tissue (marbling) and thereby improved carcass quality grade. The serum metabolites results supported the hypothesis of lipolysis of existing adipose tissue, such as abdominal fats, and lipogenesis in intramuscular adipocytes.
Keywords: Steers; Ethanol; Steers; Intramuscular Fat; Lipid Metabolism; NEFA; Triglycerides


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