This study was conducted to investigate the relationship between changes of rumen microflora and bloat in Jersey cow. Jersey cows (control age: 42 months, control weight: 558kg; treatment age: 29 months, treatment weight 507kg) were fed on the basis of dairy feeding management at dairy science division in National Institute of Animal Science. The change of microbial population in rumen was analyzed by using next generation sequencing (NGS) technologies due to metabolic disease. The diversity of Ruminococcus bromii, Bifidobacterium pseudolongum, Bifidobacterium merycicum and Butyrivibrio fibrisolvens known as major starch fermenting bacteria was increased more than 36-fold in bloated Jersey, while cellulolytic bacteria community such as Fibrobacter succinogenes, Ruminococcus albus and Ruminococcus flavefaciens was increased more than 12-fold in non-bloated Jersey. The proportion of bacteroidetes and firmicutes was 33.4% and 39.6% in non-bloated Jersey’s rumen, while bacteroidetes and firmicutes were 24.9% and 55.1% in bloated Jersey’s. In conclusion, the change of rumen microbial community, in particular the increase in starch fermenting bacteria, might have an effect to occur the bloat in Jersey cow.

ABSTRACT
 Ⅰ. 서 론
 Ⅱ. 재료 및 방법
  1. 공시축 및 공시사료
  2. 미생물 다양성 군집 분석
 Ⅲ. 결과 및 고찰
  1. 전분 분해균 변화
  2. 섬유소 분해균 변화
  3. 미생물 균총 변화
 Ⅳ. 요 약
 Ⅴ. 사 사
 Ⅵ. REFERENCES

• 김상범(농촌진흥청 국립축산과학원) | Sang Bum Kim (National Institute of Animal Science, Rural Development Administration, Republic of Korea)
• 오종석(농촌진흥청 국립축산과학원) | Jong Seok Oh (National Institute of Animal Science, Rural Development Administration, Republic of Korea)
• 정하연(농촌진흥청 국립축산과학원) | Ha Yeon Jeong (National Institute of Animal Science, Rural Development Administration, Republic of Korea)
• 정영훈(농촌진흥청 국립축산과학원) | Young Hun Jung (National Institute of Animal Science, Rural Development Administration)
• 박범영(농촌진흥청 국립축산과학원) | Beom Young Park (National Institute of Animal Science, Rural Development Administration)
• 하승민(농촌진흥청 국립축산과학원) | Seung Min Ha (National Institute of Animal Science, Rural Development Administration)
• 임석기(전북대학교 국제농업개발협력센터) | Seok Ki Im (International Agricultural Development and Cooperation center, Chonbuk National University)
• 이성실(경상대학교 동물생명과학과) | Sung Sill Lee (Department of Animal Science & Biotechnology, Gyeongsang National University)
• 박지후(농촌진흥청 국립축산과학원) | Ji Hoo Park (National Institute of Animal Science, Rural Development Administration)
• 김언태(농촌진흥청 국립축산과학원) | Eun Tae Kim (National Institute of Animal Science, Rural Development Administration) Corresponding author
• 박성민(농촌진흥청 국립축산과학원) | Seong Min Park (National Institute of Animal Science, Rural Development Administration)