The present study was conducted to evaluate the effects of high levels of nutrients on the growth performance, blood metabolites and carcass characteristics of Hanwoo cattle. Eighteen Hanwoo steers were fed two types of diets: 1) Nine animals were fed the conventional diet including typical levels of crude protein (CP) and total digestive nutrients (TDN), and 2) Nine animals were fed the treatment diet including high levels of CP and TDN. The average body weight (BW) and dry matter intake (DMI) were greater (P < 0.05) in the treatment group than in the conventional group at early and late fattening stages. Also, in the treatment group, the average daily gain (ADG) was greater (P < 0.05) at the late fattening stage. The serum total lipid and cholesterol levels were higher (P < 0.05) in the late fattening stage of treatment group. The carcass weight, total fat weight, longissimus muscle area and the grade of meat quality were also greater (P < 0.05) in the treatment group than the conventional diet group. This study demonstrates that high levels of CP and TDN exhibit a positive effect on the growth performance and carcass characteristics, indicating that high levels of CP and TDN can be used as a cost-effective feeding program for Hanwoo cattle by shortening the feeding period.

ABSTRACT
 Ⅰ. INTRODUCTION
 Ⅱ. MATERIALS AND METHODS
  1. Experimental animals and dietary treatment
  2. Blood collection and serum metabolite analysis
  3. Ultrasound image analysis and carcass characteristics
  4. Statistical analysis
 Ⅲ. RESULTS
  1. Growth performance
  2. Serum metabolite profile
  3. Carcass characteristics and meat quality
 Ⅳ. DISCUSSION
 Ⅴ. CONCLUSIONS
 Ⅵ. ACKNOWLEDGMENTS
 Ⅶ. REFERENCES

• Kondreddy Eswar Reddy(Animal Nutritional & Physiology Team, National Institute of Animal Science, Rural Development Administration)
• Jin Young Jeong(Animal Nutritional & Physiology Team, National Institute of Animal Science, Rural Development Administration)
• Sang Yun Ji(Animal Nutritional & Physiology Team, National Institute of Animal Science, Rural Development Administration)
• Youl-Chang Baek(Animal Nutritional & Physiology Team, National Institute of Animal Science, Rural Development Administration)
• Seul Lee(Animal Nutritional & Physiology Team, National Institute of Animal Science, Rural Development Administration)
• Minseok Kim(Animal Nutritional & Physiology Team, National Institute of Animal Science, Rural Development Administration, Department of Animal Science, College of Agriculture and Life Sciences, Chonnam National University)
• Young Kyun Oh(Animal Nutritional & Physiology Team, National Institute of Animal Science, Rural Development Administration)
• Hyun-Jeong Lee(Animal Nutritional & Physiology Team, National Institute of Animal Science, Rural Development Administration) Corresponding author