This experiment was conducted to investigate the effect of whole crop rice (WCR) based TMR on growth performance and carcass characteristics of Hanwoo steers. WCR “Yeongwoo”was harvested at yellow ripen stage and ensiled for 60 days. The crude protein (CP), acid detergent fiber (ADF), neutral detergent fiber (NDF), in vitro dry matter digestibility (IVDMD) and total digestible nutrient (TDN) content was 8.4 %, 28.0 %, 53.8 %, 72.4 % and 66.8 %, respectively. For silage quality, pH was 4.37 and lactic and butyric acid content were 2.84 and 0.04 % in DM. Sixteen Hanwoo steers (8-mon-old) were allocated into either a control (commercial TMR) and WCR-TMR (WCR-based TMR) group. The TMR were fed according to the feeding stage phase: growing (Initiate∼14 month), early fattening (15 month∼21 month) and late fattening (22 month∼30 month). The body weight of control group increased (P<0.05) until early fattening stage, but late growing stage of WCR-TMR group was higher than that of control (P<0.05). Average daily gain (ADG) was significantly greater (P<0.05) in WCR-TMR group (total 0.78 kg/head) compared to control (total 0.66 kg/head) except for late fattening stage. The marketing weight and carcass weight were higher in WCR-TMR group (726 vs 765 kg; 417.8 vs 450.4 kg). The back fat thickness (11.75 vs 13.00 mm), Longissimus dorsi area (88.00 vs 89.88 ㎠) and yield index (65.87 vs 64.30) were not different between the two groups (P>0.05) and also no difference in meat yield grade (A : B : C = 2 : 4 : 2). Marbling score (4.00 vs 4.13), meat color (4.75 vs 4.75), fat color (3.13 vs 2.88), texture (1.25 vs 1.50) and maturity (2.00 vs 2.00) were not significant difference between the two groups and meat quality grade (1++:1+:1:2:3=0:2:4:2:0) was also not different. In conclusion, TMR feeding based on WCR silage showed superiority in carcass yield and ADG compared to control TMR. It is considered that the use of WCR for feed is a necessary option for the substitution of the imported forages and the government's policy for rice production adjustment.

ABSTRACT
 Ⅰ. 서 론
 Ⅱ. 재료 및 방법
  1. 사료용 벼 재배 및 사일리지 조제
  2. 가축 사양 시험
  3. 사료가치 분석
  4. 체중측정
  5. 통계처리
 Ⅲ. 결과 및 고찰
  1. 사료용 벼의 생육특성 및 품질
  2. 체중 및 증체량의 변화
  3. 도체 특성 및 육량등급의 변화
  4. 육질 및 소득의 변화
 Ⅳ. 요 약
 Ⅴ. 사 사
 Ⅵ. REFERENCES

• 김종근(서울대학교 국제농업기술대학원/서울대학교 그린바이오과학기술연구원) | Jong Geun Kim (Graduate School of International Agricultural Technology, SNU/Research Institute of Eco-friendly Livestock Science, GBST, SNU) Correspondingauthor
• Zhao Guo Qiang(서울대학교 국제농업기술대학원) | Guoqiang Zhao (Graduate School of International Agricultural Technology, SNU)
• Liu Chang(서울대학교 국제농업기술대학원) | Chang Liu (Graduate School of International Agricultural Technology, SNU)
• Wei Sheng Nan(서울대학교 국제농업기술대학원)
• 김학진(서울대학교 그린바이오과학기술연구원) | Hak Jin Kim (Research Institute of Eco-friendly Livestock Science, GBST, SNU)
• 김경훈(서울대학교 국제농업기술대학원/서울대학교 그린바이오과학기술연구원) | Kyoung Hoon Kim (Graduate School of International Agricultural Technology, SNU/Research Institute of Eco-friendly Livestock Science, GBST, SNU)
• 안억근(국립식량과학원) | Eok Geun Ahn (National Institute of Crop Science)
• 민형규(산청군농업기술센터) | Hyung-Gyu Min (Sancheong Agricultural Development & Technology Center)