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KMID : 0613820080180111561
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Journal of Life Science
2008 Volume.18 No. 11 p.1561 ~ p.1569
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Effects of Steam Flaking on In situ DM Digestibility and Aflatoxin and Ochratoxin Contents during Storage of Corns
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Lee Shin-Ja
Lee Ji-Hun
Shin Nyeon-Hak
Hyun Jong-Hwan
Moon Yea-Hwang
Lee Sang-Suk
Lee Sung-Sill
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Abstract
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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℃/ 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.
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KEYWORD
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Corn, steam flake, in situ DM disappearance, aflatoxin, ochratoxin
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