Studies on Growth Performance and Meat Quality Improvement of the Unselected Hanwoo Bulls in the Performance Test
2010
Kim, H.C., National Institute of Animal Science, RDA, Pyeongchang, Republic of Korea | Lee, C.W., Gangwon Province Livestock Research Center, Hoengseong, Republic of Korea | Park, B.K., National Institute of Animal Science, RDA, Pyeongchang, Republic of Korea | Lee, S.M., National Institute of Animal Science, RDA, Pyeongchang, Republic of Korea | Kwon, E.G., National Institute of Animal Science, RDA, Pyeongchang, Republic of Korea | Im, S.K., National Institute of Animal Science, RDA, Pyeongchang, Republic of Korea | Jeon, G.J., National Institute of Animal Science, RDA, Pyeongchang, Republic of Korea | Park, Y.S., Gangwon Province Livestock Research Center, Hoengseong, Republic of Korea | Hong, S.K., National Institute of Animal Science, RDA, Pyeongchang, Republic of Korea
This study was conducted to investigate the growth performance and meat quality improvement according to castration, optimal feeding management and ruminally protected amino acid-enriched fatty acid (RPAAFA) for the unselected Hanwoo bulls in the performance test. Bulls were castrated at approximately 14 months of age. Sixteen Hanwoo steers, 15 months of age and weighing 412.9±24.9 kg, were distributed into 2 groups. Steers were fed a basal diet supplemented with RPAAFA at 0 g (control) or 100 g (treatment), respectively for 12 months. Steers were slaughtered at 27 months of age. Average daily gain for treatment tended to be higher (p=0.10) than that of control, whereas feed conversion ratio tended to be lower (p=0.07) in treatment than in control. The supplementation of RPAAFA did not affect rib eye area, back fat thickness, meat color, fat color, texture and maturity. The appearance rates of yield 'A' grade and high quality grade (1++, 1+ and 1) were higher in treatment than in control. The content of moisture, fat, protein and ash in longissimus muscles were similar between control and treatment. The supplementation of RPAAFA did not affect water-holding capacity, oxidation and reduction potential, myoglobin and fatty acid contents in longissimus muscles. Thus, present results indicate that castration, optimal feeding management and RPAAFA may be recommended for improving growth performance and quality grade of the unselected Hanwoo bulls in the performance test.
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