Impact of subacute ruminal acidosis (SARA) adaptation and recovery on the density and diversity of bacteria in the rumen of dairy cows
作者： Sarah E. Hook , Michael A. Steele , Korinne S. Northwood , Jan Dijkstra , James France
DOI: 10.1111/J.1574-6941.2011.01154.X
关键词: Hay 、 Population 、 Biology 、 Animal science 、 Eubacterium 、 Selenomonas ruminantium 、 Rumen 、 Bacteria 、 Microbiology 、 Acidosis 、 Feces 、 Ecology (disciplines) 、 Applied Microbiology and Biotechnology
摘要: Subacute ruminal acidosis (SARA) is characterized by pH depression and microbial perturbation. The impact of SARA adaptation recovery on rumen bacterial density diversity was investigated following high-grain feeding. Four ruminally cannulated dairy cows were fed a hay diet, transitioned to 65% grain diet for 3 weeks, returned the weeks. Rumen fluid, solids, feces sampled during weeks 0 (hay), 1 (high grain), 4 6 (hay). diagnosed week 1, with below 5.6 4.6±1.4 h. Bacterial significantly lower in solids high (P=0.047). fluid clone libraries from 0, 3, assessed at 98% level 154 operational taxonomic units resolved. Week differed community structure (P<0.0001). Clones belonging phylum Firmicutes predominated. Compared contained clones Selenomonas ruminantium Succiniclasticum ruminis, but lacked Eubacterium spp. found alter density, diversity, structure, warranting further investigation into role bacteria play adaptation.
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