This study aimed to estimate the rumen fermentation characteristics and greenhouse gas emissions of major domestic feed sources for Hanwoo. Five feed sources mainly used in South Korea were selected: corn meal (CM), soybean meal (SM), wheat flour (WF), palm kernel cake (PKC), and corn distiller’s dried grains with soluble (DDGS). These feed sources were purchased from a commercial feed company. For 24 h rumen incubation, each feed source (0.3 g) was placed into the incubation bottle with the rumen mixture (30 mL) in quadruplicates. After incubation, total gas production was measured and sub-sampled for CO2 and CH4 analyses, and the bottle content was centrifuged for rumen fermentation characteristics and in vitro dry matter digestibility (IVDMD). Crude protein content was highest in SM and lowest in CM. Ether extract content was highest in DDGS and lowest in SM, while neutral detergent fiber and acid detergent fiber contents were highest in PKC and lowest in CM. Propionate content was highest in DDGS, and butyrate and A:P ratio contents were highest in PKC (p<0.05). Total gas emission (mL/g DMD) was lowest in SM and DDGS, while CH4 emission (mL/g DMD) was lowest in DDGS (p<0.05). Therefore, this study concluded that DDGS could be an alternative feed source to reduce methane emissions.

ABSTRACT
Ⅰ. 서론
Ⅱ. 재료 및 방법
    1. 주요 원료사료
    2. 영양소 함량
    3. 반추위 내 소화율 및 발효특성
    4. 반추위 내 가스 발생량
    5. 통계처리
Ⅲ. 결과 및 고찰
    1. 원료사료의 영양소 함량
    2. 원료사료의 반추위 내 소화율 및 발효특성
    3. 원료사료의 반추위 내 가스 발생량
Ⅳ. 요약
Ⅴ. 사사
Ⅵ. REFERENCES

• 김지윤(경상국립대학교 응용생명과학부(BK21 Four)) | Ji Yoon Kim (Division of Applied Life Science (BK21Four, Institute of Agriculture and Life Science), Gyeongsang National University, Jinju 52828, Republic of Korea)
• 주영호(경상북도 축산기술연구소) | Young Ho Joo (Gyeongsangbuk-do Livestock Research Institute, Yeongju 36052, Republic of Korea)
• 백창현(경상국립대학교 응용생명과학부(BK21 Four)) | Chang Hyun Baeg (Division of Applied Life Science (BK21Four, Institute of Agriculture and Life Science), Gyeongsang National University, Jinju 52828, Republic of Korea)
• 최부길(경상국립대학교 응용생명과학부(BK21 Four)) | Bu Gil Choi (Division of Applied Life Science (BK21Four, Institute of Agriculture and Life Science), Gyeongsang National University, Jinju 52828, Republic of Korea)
• 애린다(경상국립대학교 응용생명과학부(BK21 Four)) | Arrynda Rachma Dyasti Wardani (Division of Applied Life Science (BK21Four, Institute of Agriculture and Life Science), Gyeongsang National University, Jinju 52828, Republic of Korea)
• 정승민(국립축산과학원 초지사료과) | Seung Min Jeong (Grassland and Forages Division, National Institute of Animal Science, RDA, Cheonan 31000, Republic of Korea)
• 김삼철(경상국립대학교 응용생명과학부(BK21 Four)) | Sam Churl Kim (Division of Applied Life Science (BK21Four, Institute of Agriculture and Life Science), Gyeongsang National University, Jinju 52828, Republic of Korea) Corresponding author