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Ammonia-hyperproducing bacteria from New Zealand ruminants

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Attwood, G. T., Klieve, A. V., Ouwerkerk, D. and Patel, B. K. (1998) Ammonia-hyperproducing bacteria from New Zealand ruminants. Applied and environmental microbiology, 64 (5). pp. 1796-1804. ISSN 0099-22401098-5336


Article Link: https://doi.org/10.1128/AEM.64.5.1796-1804.1998

Organisation URL: https://pubmed.ncbi.nlm.nih.gov/9572953
Organisation URL: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC106232/


Pasture-grazed dairy cows, deer, and sheep were tested for the presence of ammonia-hyperproducing (HAP) bacteria in roll tubes containing a medium in which tryptone and Casamino Acids were the sole nitrogen and energy sources. Colonies able to grow on this medium represented 5.2, 1.3, and 11.6% of the total bacterial counts of dairy cows, deer, and sheep, respectively. A total of 14 morphologically distinct colonies were purified and studied further. Restriction fragment length polymorphisms of 16S rRNA genes indicated that all isolates differed from the previously described HAP bacteria, Clostridium aminophilum, Clostridium sticklandii, and Peptostreptococcus anaerobius. Carbon source utilization experiments showed that five isolates (C2, D1, D4, D5, and S1) were unable to use any, or very few, of the carbon sources tested. Biochemical tests and phylogenetic analyses of 16S ribosomal DNA sequences indicated that all isolates were monensin sensitive; that D1 and S1 belonged to the genus Peptostreptococcus, that D4 and D5 belonged to the family Bacteroidaceae, where D4 was similar to Fusobacterium necrophorum; and that C2 was most similar to an unidentified species from the genus Eubacterium. Growth on liquid medium containing tryptone and Casamino Acids as the sole nitrogen and energy source showed that D1, D4, and S1 grew rapidly (specific growth rates of 0.40, 0.35, and 0.29 h-1, respectively), while C2 and D5 were slow growers (0.25 and 0.10 h-1, respectively). Ammonia production rates were highest in D1 and D4, which produced 945.5 and 748.3 nmol/min per mg of protein, respectively. Tests of individual nitrogen sources indicated that D1 and D4 grew best on tryptone, S1 grew equally well on Casamino Acids or tryptone, and C2 and D5 grew poorly on all nitrogen sources. The intact proteins casein and gelatin did not support significant growth of any of the isolates. These isolates extend the diversity of known HAP rumen bacteria and indicate the presence of significant HAP bacterial populations in pasture-grazed New Zealand ruminants.

Item Type:Article
Additional Information:9572953[pmid] PMC106232[pmcid]
Keywords:Ammonia/*metabolism Animals Cattle Culture Media Deer Gram-Positive Bacteria/classification/*isolation & purification/metabolism Nitrogen/metabolism Phylogeny Polymorphism, Restriction Fragment Length Rumen/*microbiology Sheep
Subjects:Science > Microbiology > Microbial ecology
Science > Microbiology > Microorganisms in the animal body
Science > Microbiology > Bacteria
Animal culture > Cattle
Animal culture > Sheep
Animal culture > Deer
Veterinary medicine > Veterinary microbiology
Veterinary medicine > Veterinary bacteriology
Live Archive:15 Oct 2020 03:32
Last Modified:03 Sep 2021 16:46

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