Effects of feeding system on growth performance, plasma biochemical components and hormones, and carcass characteristics in Hanwoo steers

  • Chung, Chan Sung (Gyeonggido Livestock and Veterinary Service) ;
  • Cho, Woong Ki (Division of Applied Life Science(Institute of Agriculture & Life Science), BK21 plus, Gyeongsang National University) ;
  • Jang, In Seok (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology) ;
  • Lee, Sung Sill (Division of Applied Life Science(Institute of Agriculture & Life Science), BK21 plus, Gyeongsang National University) ;
  • Moon, Yea Hwang (Department of Animal Science and Biotechnology, Gyeongnam National University of Science and Technology)
  • Received : 2017.03.03
  • Accepted : 2017.05.27
  • Published : 2017.08.01


Objective: This study was conducted to compare growth performance, blood components and carcass traits by two feeding systems (concentrate with roughage separately [CON] vs total mixed ration [TMR]) in Hanwoo steers, and to learn the relationship between blood components during fattening or finishing phases and carcass traits in Hanwoo steers. Methods: Sixty steers aged 8 months were allotted to two feeding systems and fed similar amounts of average dry matter and total digestible nutrient throughout whole experimental period according to each feeding program. Steers were weighed monthly, taken blood at the end of growing, fattening and finishing periods, and slaughtered at 30 month of age. Results: Growing performance was higher (p<0.05) in the CON group compared to the TMR group during fattening and finishing periods. The CON group was lower (p<0.05) in blood aspartic acid transaminase, blood urea nitrogen and retinol levels during growing period, but higher in triglyceride and cholesterol levels during fattening and finishing periods compared to the TMR group. The CON group was greater (p<0.05) in rib-eye area, and lighter (p<0.05) red in meat color compared to the TMR group. In the correlation coefficients between blood components of steers and carcass traits, retinol had a negative (p<0.05) correlation with marbling score and rib-eye area. Leptin had a positive (p<0.05) correlation with back fat thickness. Blood cholesterol and triglyceride were positively (p<0.05) correlated with carcass weight and rib-eye area. Conclusion: Growth performance, carcass ribeye area and meat color showed a more desirable result in the CON compared to the TMR in Hanwoo steers. Assessing the accumulated data of carcass traits with blood components including hormones-particularly retinol, cholesterol, triglyceride, and leptin-during the fattening or finishing phases, it may be possible to find a biomarker for determining beef quality in living animals.


Feeding System;Performance;Blood Component;Carcass Traits;Hanwoo Steer


Supported by : Gyeongnam National University of Science & Technology


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