The objective of this study was to determine how feeding forage and concentrate separately (SF) or as a total mixed ration (TMR) affects enteric methane production of cattle. Six Holstein steers (203 ± 22.5 kg) were used in a 2 × 3 changeover design experiment. Experimental diets (TMR and SF) consisted of compound feed, timothy hay and soybean curd residue in a ratio of 40:48:12, respectively, and diets were fed at 10% of metabolic body weight, on an as-fed basis. There were no differences in dry matter intake and enteric methane production (g/d) between SF and TMR but the methane conversion rate (methane energy/GE intake) of TMR was significantly higher (p=0.05) than that of SF. The mean methane emission factor (kg/head/year) and conversion rate of the two treatments were 21.4 and 0.05, respectively. There was a strong relationship between metabolic body weight and enteric methane production (p<0.001). At the present time, further studies may be necessary in order to establish the effects of TMR and SF on enteric methane production.

Ⅰ. 서 론
 Ⅱ. 재료 및 방법
 Ⅲ. 결과 및 고찰
 Ⅳ. 요 약
 Ⅴ. 사 사
 Ⅵ. REFERENCES

• 이윤석(서울대학교 그린바이오과학기술연구원) | Yoonseok Lee
• Rajaraman Bharanidharana(서울대학교 국제농업기술대학원)
• 박재현(축산환경관리원) | Jae-Hyun Park
• 장선식(국립축산과학원 한우연구소) | Sun Sik Jang
• 여준모(국립한국농수산대학 대가축학과) | Joon Mo Yeo
• 김완영(국립한국농수산대학 대가축학과) | Wan Young Kim
• 김경훈(서울대학교 그린바이오과학기술연구원, 서울대학교 국제농업기술대학원) | Kyoung Hoon Kim Corresponding author