Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effects of Steam Flaking on In situ DM Digestibility and Aflatoxin and Ochratoxin Contents during Storage of Corns

옥수수의 steam flake 처리가 in situ 건물소화율 및 저장기간별 aflatoxin과 ochratoxin 함량에 미치는 영향

  • Lee, Shin-Ja (Division of Applied Life Science(BK 21 Program), Graduate School of Gyeongsang National University) ;
  • Lee, Ji-Hun (Division of Applied Life Science(BK 21 Program), Graduate School of Gyeongsang National University) ;
  • Shin, Nyeon-Hak (Division of Applied Life Science(BK 21 Program), Graduate School of Gyeongsang National University) ;
  • Hyun, Jong-Hwan (Division of Applied Life Science(BK 21 Program), Graduate School of Gyeongsang National University) ;
  • Moon, Yea-Hwang (1Department of Animal Sci. & Biotech., Jinju National University,) ;
  • Lee, Sang-Suk (Department of Animal Science & Biotechnology, Sunchon National University) ;
  • Lee, Sung-Sill (Division of Applied Life Science(BK 21 Program), Graduate School of Gyeongsang National University)
  • 이신자 (경상대학교 응용생명과학부(BK 21)) ;
  • 이지훈 (경상대학교 응용생명과학부(BK 21)) ;
  • 신년학 (경상대학교 응용생명과학부(BK 21)) ;
  • 현종환 (경상대학교 응용생명과학부(BK 21)) ;
  • 문여황 (진주산업대학교 동물생명과학과) ;
  • 이상석 (순천대학교 동물자원과학과) ;
  • 이성실 (경상대학교 응용생명과학부(BK 21))
  • Published : 2008.11.30
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Abstract

This study was conducted to investigate the effects of steam flaking of corn grains on in situ dry matter degradability in the rumen and contents of mycotoxins (aflatoxin, ochratoxin) during storage. Yellow dent corns imported from USA and India were flaked, and stored for 8 weeks under the standard temperature and pressure (STP; $25^{\circ}C$/ 1 atm.). Experimental treatments were composed of four corn grains (untreated-USA corn, USCW; steam flaked-USA corn, USCF; untreated-India corn, IDCW; steam flaked-India corn, IDCF) with 4 replications according to 9 storage periods (0, 1, 2, 3, 4, 5, 6, 7, 8 week). Two ruminally cannulated Holstein bulls were used for in situ trial. Pathogen contamination trial was performed by comparing the mycotoxin contents in corns during storage periods. Dry matter disappearance rate in the rumen was about 3.0 to 44.1% higher (P<0.05) for USCW than IDCW, but was not difference between USCF and IDCF. With steam flaking of corn, dry matter degradability in the rumen was significantly (P<0.05) increased in corn from India, but was not affected in corn from USA. Aflatoxin content was very low level in corns from USA and steam flaked corns, but was higher than the tolerance limit of domestic aflatoxin content regulation when IDCW was stored over 6 week under STP. Ochratoxin content was low level in all treatments. From above results, it is reasonable that the corn imported from India might be flaked for enhance the ruminal DM degradability and safe from aflatoxin pathogen.

본 연구는 옥수수 수입원과 steam flake 처리에 따른 in situ 건물 분해율 및 보관기간별 mycotoxins 함량을 조사하기 위하여 수행되었다. 미국과 인도산 옥수수(yellow dent corn)를 공시재료로 하여, steam flake 처리 효과에 대해 조사하였다. 시험구는 총 4개의 처리구(USCW, 미국산 무처리 옥수수; USCF, 미국산 steam flaking 옥수수; IDCW, 인도산무처리 옥수수; IDCF, 인도산 steam flaking 옥수수)를 두고, 각 처리구당 보관기간(0, 1, 2, 3, 4, 5, 6, 7, 8주)별 4반복으로 수행되었다. In situ 시험을 위해서 반추위 누관이 장착된 Holstein 수소 2두가 이용되었고, 공장환경분야 표준상태 (STP, standard temperature and pressure, $25^{\circ}C$ 1 atm.)에서 보관기간 동안 매주, 곰팡이 독소인 aflatoxin과 ochratoxin의 농도를 측정하였다. 옥수수의 반추위 내 발효시간별 in situ 건물 소실율은 무처리구에서는 미국산이 인도산보다 약 $3.0{\sim}44.1%$ 높았으나, steam flaking 처리를 함으로써 건물소실율의 차이가 없어졌다. 미국산 옥수수는 무처리 알곡의 건물 분해율이 높은 편이었으나, flake처리에 의한 영향이 적은 반면, 인도산 옥수수는 무처리 알곡의 건물 분해율은 낮은 편이지만 flake 처리를 하였을 때, 분해율이 크게 증가되었다. 미국산 옥수수와 flake 처리 옥수수의 aflatoxin 함량은 보관기간 동안 매우 낮은 수준이었으나, 인도산 옥수수 알곡을 6주 이상 보관할 경우, 허용기준치를 초과하였다. 따라서 인도산 옥수수 알곡을 장기보관 해야 할 경우, steam flake 처리를 하는 것이 aflatoxin 오염방지를 위해서 필수적이며, 알곡으로 보관할 경우는 6주 이상을 넘기지 않는 것이 중요할 것으로 사료된다.

Keywords

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