발효 미역부산물이 반추위 발효특성에 미치는 영향
Effect of Fermented Brown Seaweed Waste(FBSW) on in vitro Rumen Microbial Fermentation
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DS-01 균주 접종에 의한 미역부산물 발효산물이 분해 정도, 영양소 변화 및 미생물오염 정도에 관한 관찰과 반추위 발효성상에 미치는 영향을 관찰하여 미역부산물의 저장성 확보와 반추동물의 사료로서의 이용가능성을 발효단계에 따라 조사하였다. DS-01 균주와 함께 배양된 미역부산물은 발효 1개월부터 현저한 분해율을 보이기 시작했다. 미역부산물중의 영양성분 함량은 발효와 함께 커다란 변화를 나타내지 않았으며 모든 처리에서 반추동물에 병원성을 가지는 미생물은 검출되지 않았다. In vitro 실험에서는 발효시간 및 첨가농도에 따른 pH 변화, 암모니아태 질소와 휘발성지방산의 생성에 대한 영향을 조사하였다. pH의 경우 6% FBSW는 1개월 및 2개월 발효조건에서 대조구, 2% 및 4% FBSW 보다 pH 값이 증가한 것을 나타내었다. 암모니아태 질소의 생성에 미치는 영향을 보면 1개월 FBSW 경우 실험 3시간 경과 후가 대조구에 비해 높은 농도를 나타내었지만 시간이 경과에 따라 대조구보다 감소한 경향을 보인다. 2개월 FBSW의 경우 4% 첨가량만 24시간 경과 후 타 처리구에 비해 높은 농도를 나타내었다. 특히, 전 발효기간 동안 6% FBSW 처리구가 발효 3시간과 24시간 경과 후 타 처리구에 비하여 낮게 나타나는 경향을 보였다. 휘발성지방산의 경우 발효 1개월 미역부산물의 4, 6% FBSW 첨가구가 6시간 경과 후 총 VFA의 농도가 현저하게 증가하는 양상을 나타내었고(p<0.05), 발효 2개월 미역부산물의 2, 4% FBSW 첨가구가 9시간 경과 후 총 VFA 농도가 6% FBSW 첨가구에 비해 현저하게 증가하는 양상을 나타냈다(p<0.05).
Abstract
This study was conducted to investigate the effects of brown seaweed waste(BSW) fermented with DS-01 microbe on in vitro rumen microbial fermentation. In in vitro trial, three different diets supplemented with 2%, 4%, 6% BSW fermented with DS-01 either for one month or two months was tested at 3 h, 6 h, 9 h, 12 h, and 24 h incubation. The chemical composition(CP, EE, CF, and ash) between brown seaweed waste(BSW) and fermented BSW(FBSW) were not different. The contamination of pathogenic microbes was not detected in FBSW. The pH value tended to be higher with 6% level of supplementation of FBSW for one month than other treatments. The pH at 24 h was significantly higher in FBSW than that of treatments without FBSW (p<0.05). In FBSW for two months, the pH value in 6% FBSW at 3 h in vitro fermentation tended to be higher than 2% or 4% FBSW treatments(p=0.0540), but there were no differences in other fermentation times. Although the concentration of NH_3-N of BSW fermented for one month was higher than control at 3h(p<0.05), the volatile fatty acid values were significantly increased in 4 and 6% FBSW fermented for one month at 6 h incubation(p<0.05). In BSW fermented for two months, the volatile fatty acid values were significantly decreased in 6% treatment at 9h(p<0.05). As a result of in vitro trial, it was recommended that the 2~4% supplementation level of brown seaweed waste fermented with DS-01 microbe for two months could be utilized for in vivo trial in ruminants.
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