This study aimed to investigate the effect of using corn flakes, produced by pressurized steam chamber, on nutrient disappearance rate and energy value in three Hanwoo and three Holstein cows, implanted with a ruminal fistula. Corn flakes were categorized in 2 groups based on the chamber type: control (corn flakes produced using a steam chamber) and treatment (corn flakes produced using a pressurized steam chamber). Dry matter (DM) disappearance rate was 5.17% higher in treatment than in control (p<0.01). Starch disappearance rate was also higher in the treatment than in the control (p<0.01). Nitrogen free extract (NFE) and non-fiber carbohydrate (NFC) disappearance rates were 6.08 and 5.71% higher in treatment compared to control, respectively (p<0.01). In comparison by breed and incubation time, DM, starch, NFE, and NFC disappearance rates were higher in treatment than in control. The mean total digestible nutrients (TDN) was higher in treatment than in control (p<0.05). In comparison between Hanwoo and Holstein, TDN of corn flakes was slightly but not significantly higher in Holstein than in Hanwoo. Thus, these results indicate that the use of the pressurized steam chamber is recommended to increase the nutrient (starch, NFE, NFC etc.) disappearance rate and TDN.

ABSTRACT
 Ⅰ. 서론
 Ⅱ. 재료 및 방법
  1. 시험장소, 시험기간, 공시동물 및 사양관리
  2. 시험구 처리
  3. 조사항목 및 분석방법
  4. 통계분석
 Ⅲ. 결과
  1. In situ 반추위 영양소 소실율
  2. TDN 가치 평가
 Ⅳ. 고찰
 Ⅴ. 요약
 Ⅵ. 참고문헌

• 박병기(농협사료) | Byung-Ki Park (Nonghyup Feed Co. LTD.)
• 안준상(국립축산과학원 한우연구소) | Jun-Sang Ahn (Hanwoo Research Institute, National Institute of Animal Science, RDA)
• 정기용(국립축산과학원 한우연구소) | Ki-Yong Chung (Hanwoo Research Institute, National Institute of Animal Science, RDA)
• 조성면(강원대학교 동물생명과학대학) | Sung-Myoun Cho (Division of Animal Resource Science, Kangwon National University)
• 김일영(강원대학교 동물생명과학대학) | Il-Young Kim (Division of Animal Resource Science, Kangwon National University)
• 심재윤(강원대학교 동물생명과학대학)
• 김민지(강원대학교 동물생명과학대학) | Min-Ji Kim (Division of Animal Resource Science, Kangwon National University)
• 권응기(국립축산과학원 한우연구소) | Eung-Gi Kwon (Hanwoo Research Institute, National Institute of Animal Science, RDA)
• 신종서(강원대학교 동물생명과학대학) | Jong-Suh Shin (Division of Animal Resource Science, Kangwon National University) Corresponding author