Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Effects of the Brown Seaweed Residues Supplementation on In Vitro Fermentation and Milk Production and Composition of Lactating Dairy Cows

미역부산물 첨가가 In Vitro 발효성상과 젖소의 산유량 및 유성분에 미치는 영향

  • Baek, I.K. (Faculty of Animal Life Science, Konkuk University) ;
  • Maeng, W.J. (Faculty of Animal Life Science, Konkuk University) ;
  • Lee, S.H. (Faculty of Animal Life Science, Konkuk University) ;
  • Lee, H.G. (School of Agricultural Biotechnology, Seoul National University) ;
  • Lee, S.R. (Faculty of Animal Life Science, Konkuk University) ;
  • Ha, J.K. (School of Agricultural Biotechnology, Seoul National University) ;
  • Lee, S.S. (Department of Dairy Science, Gyeongsang National University) ;
  • Hwang, J.H. (Department of Animal Sciences, Sangju National University)
  • 백인규 (건국대학교 동물생명과학부) ;
  • 맹원재 (건국대학교 동물생명과학부) ;
  • 이성훈 (건국대학교 동물생명과학부) ;
  • 이홍구 (서울대학교 농생명공학부) ;
  • 이상락 (건국대학교 동물생명과학부) ;
  • 하종규 (서울대학교 농생명공학부) ;
  • 이성실 (경상대학교 낙농학과) ;
  • 황주환 (상주대학교 축산학과)
  • Published : 2004.06.30
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Abstract

This study was conducted to investigate effects of the brown seaweed residues supplementation on in vitro fermentation, and milk yield and milk composition of dairy cows. Therefore, two experiments consisting of an in vitro and an in vivo growth trial were used. In in vitro experiment, brown seaweed residues(BSR) was supplemented in basal diet with 0, 1, 2 and 4% respectively, and incubated for 3, 6, 9, 12, and 24 h. The pH value, ammonia-N and VFA were investigated. The pH value tended to increase with increasing BSR during the incubation. Particularly, pH was significantly higher in BSR treatments compared with control at 9 h(p < 0.05). While, ammonia-N concentration was not significantly different across treatments during the whole incubation. BSR supplementation did not affect total VFA production, but acetate was linearly increased in BSR treatments compared with control at 12 h(p < 0.05), and its concentration was highest(92.70 mM) in 4% BSR among treatments. The concentration of iso-butyrate tended to increase in BSR treatments in comparison to control during the incubation. In addition, the concentration of iso-valerate was higher in BSR treatments compared with control at 12 and 24 h. In growth trial, BSR was added(800 g/d/animaI) to diets of dairy cow. Dry matter intake was not affected by BSR supplementation, but daily milk yield(kg) significantly increased in BSR treatment compared with control(p < 0.05). However, milk composition(%) and milk yield(kg) were not significantly different between treatments. Milk fat(% and kg/d) tended to slightly decrease in BSR treatment compared with control(3.59% and 1.06 kg/d vs. 3.32% and 1.01 kg/d), The contents of C16:0 and C20:4 in milk significantly increased in BSR treatment compared with control reflecting from dietary fatty acid composition. The content of C18:0 in milk which is end product of biohydrogenation of CI8 unsaturated fatty acids in the rumen significantly increased in BSR treatment compared with control(p < 0.05). C18:2 content in milk tended to decrease, but tended to increase trans-II C18:l and CLA contents in milk in BSR treatment compared with control. In conclusion, it could be summarized that BSR may stabilize rumen pH, and it could improve milk yield and CIA content in milk with more than 4% of diet. Therefore, BSR could be beneficially used in dairy diets as a feed additive.

본 연구는 해양부존사료자원으로서 미역부산물의 사료적 가치와 착유우의 산유특성에 미치는 영향을 평가하기 위해 in vitro 반추위 발효성상(실험 1)과 산유성적 및 유지방산 조성(실험 2)을 조사하였다. 실험 1에서는 기초사료에 미역부산물(BSR;brown seaweed residues)을 0, 1, 2, 4% 수준으로 첨가하여 in vitro 배양장치에서 3, 6, 9, 12 및 24시간동안 배양한 후, rumen parameter(pH, 암모니아태 질소 및 휘발성지방산)를 조사하였다. 미역부산물의 첨가 비율의 증가는 배양시간이 지속됨에 따라 pH가 대조군에 비하여 다소 높아지는 경향을 나타내었으며, 특히 배양 9시간에 대조구(5.39)에 비하여 처리구에서 유의하게 증가하였다(P < 0.05). 그리고, 미역부산물이 반추위내 암모니아태 질소농도에도 전 배양시간에 걸쳐 유의한 효과가 나타나지 않았다. 미역부산물의 첨가는 휘발성지방산생성에 유의한 영향을 미치지 않았으나, acetate 생성량은 배양 12시간에서 대조군(87.29mM)에 비하여 처리군에서 유의하게 직선적으로 증가하였고(P < 0.05), 미역부산물 4% 첨가군에서 92.70mM로서 가장 높게 나타났다. iso-butyrate는 미역부산물의 첨가수준이 증가함에 따라 전반적으로 대조구에 비해 증가하는 경향을 나타내었고, iso-valerate 역시 배양 12시간과 24시간에 첨가군에서 증가하는 경향을 나타내었다(P > 0.05). 실험 2에서는 미역부산물의 착유우에 대한 산유특성을 조사한 것으로 급여량은 1일 두당 800g의 수준으로 급여하여 대조군과 비교하였다. 사료건물섭취량은 처리구에 의해 영향을 받지 않았고, 1일 산유량은 대조구에 비하여 처리군에서 유의하게 증가하였다(P < 0.05). 하지만, 유성분율과 생산량은 처리구간에 유의한 차이가 나타나지 않았고, 유지방은 조성(%)과 생산량(kg)에 있어서 대조군의 3.59%와 1.06kg에 비하여 처리군에서 각각 3.32%와 1.01kg으로 다소 낮아지는 경향을 나타내었다. 우유 내에는 C16 : 0 및 C20 : 4 지방산이 대조군에 비하여 처리군에서 유의하게 증가하였고, 이는 미역부산물의 지방산 조성을 그대로 반영해 주었으며, C18계 불포화지방산의 수소 첨가현상의 최종산물인 C18 : 0의 비율 또한 유의하게 증가하였다(P < 0.05). 우유 중 C18 : 2 함량은 대조군에 비하여 처리군에서 감소하는 대신 불완전한 C18계 불포화지방산의 수소 첨가현상으로 생성되는 trans-11 C18 : 1과 CLA 함량이 다소 증가하는 경향을 나타내었다. 이와 같이 미역부산물은 반추위내 pH를 안정시킬 뿐만 아니라 산유량 증대, 그리고 사료 내 4% 이상으로 첨가시 우유 내 CLA 함량을 증가시킬 것으로 사료되므로, 부존사료자원으로서의 잠재적 가치가 충분하다고 판단된다.

Keywords

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