Animal Bioscience

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effects of feeding high-energy diet on growth performance, blood parameters, and carcass traits in Hanwoo steers

  • Kang, Dong Hun (Department of Animal Science, Korea National University of Agriculture and Fisheries) ;
  • Chung, Ki Yong (Department of Animal Science, Korea National University of Agriculture and Fisheries) ;
  • Park, Bo Hye (Department of Animal Science, Korea National University of Agriculture and Fisheries) ;
  • Kim, Ui Hyung (Hanwoo Research Institute, National Institute of Animal Science) ;
  • Jang, Sun Sik (Hanwoo Research Institute, National Institute of Animal Science) ;
  • Smith, Zachary K. (Department of Animal Science, South Dakota State University) ;
  • Kim, Jongkyoo (Department of Animal Science and Food Science and Human Nutrition, Michigan State University)
  • Received : 2022.01.07
  • Accepted : 2022.04.14
  • Published : 2022.10.01
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Abstract

Objective: Our study aimed to investigate the effects of a 2% increase in dietary total digestible nutrients (TDN) value during the growing (7 to 12 mo of age) and fattening (13 to 30 mo of age) period of Hanwoo steers. Methods: Two hundred and twenty Hanwoo steers were assigned to one of two treatments: i) a control group (basal TDN, BTDN, n = 111 steers, growing = 70.5%, early fattening = 71.0%, late fattening = 74.0%) or high TDN (HTDN, n = 109 steers, growing = 72.6%, early = 73.1%, late = 76.2%). Growth performance, carcass traits, blood parameters, and gene expression of longissimus dorsi (LD) (7, 18, and 30 mo) were quantified. Results: Steers on the BTDN diets had increased (p≤0.02) DMI throughout the feeding trial compared to HTDN, but gain did not differ appreciably. A greater proportion of cattle in HTDN received Korean quality grade 1 (82%) or greater compared to BTDN (77%), while HTDN had a greater yield grade (29%) than BTDN (20%). Redness (a*) of LD muscle was improved (p = 0.021) in steers fed HTDN. Feeding the HTDN diet did not alter blood parameters. Steers fed HTDN diet increased (p = 0.015) the proportion of stearic acid and tended to alter linoleic acid. Overall, saturated, unsaturated, monounsaturated, and polyunsaturated fatty acids of LD muscle were not impacted by the HTDN treatment. A treatment by age interaction was noted for mRNA expression of myosin heavy chain (MHC) IIA, IIX, and stearoyl CoA desaturase (SCD) (p≤0.026). No treatment effect was detected on gene expression from LD muscle biopsies at 7, 18, and 30 mo of age; however, an age effect was detected for all variables measured (p≤0.001). Conclusion: Our results indicated that feeding HTDN diet could improve overall quality grade while minimum effects were noted in gene expression, blood parameters, and growing performance. Cattle performance prediction in the feedlot is a critical decision-making tool for optimal planning of cattle fattening and these data provide both benchmark physiological parameters and growth performance measures for Hanwoo cattle feeding enterprises.

Keywords

Acknowledgement

This study was supported by Cooperative Research Program for Agriculture Science & Technology Development (Project No. PJ0150252022) Rural Development Administration, Republic of Korea.

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