Document Detail


Seasonal changes in the ruminal microflora of the high-arctic Svalbard reindeer (Rangifer tarandus platyrhynchus).
MedLine Citation:
PMID:  4026289     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The dominant rumen bacteria in high-arctic Svalbard reindeer were characterized, their population densities were estimated, and ruminal pH was determined in summer, when food quality and availability are good, and in winter, when they are poor. In summer the total cultured viable population density was (2.09 +/- 1.26) X 10(10) cells ml-1, whereas in winter it was (0.36 +/- 0.29) X 10(10) cells ml-1, representing a decrease to 17% of the summer population density. On culture, Butyrivibrio fibrisolvens represented 22% of the bacterial population in summer and 30% in winter. Streptococcus bovis represented 17% of the bacterial population in summer but only 4% in winter. Methanogenic bacteria were present at 10(4) cells ml-1 in summer and 10(7) cells ml-1 in winter. In summer and winter, respectively, the proportions of the viable population showing the following activities were as follows: starch utilization, 68 and 63%; fiber digestion, 31 and 74%; cellulolysis, 15 and 35%; xylanolysis, 30 and 58%; proteolysis, 51 and 28%; ureolysis, 40 and 54%; and lactate utilization, 13 and 4%. The principal cellulolytic bacterium was B. fibrisolvens, which represented 66 and 52% of the cellulolytic population in summer and winter, respectively. The results indicate that the microflora of the rumen of Svalbard reindeer is highly effective in fiber digestion and nitrogen metabolism, allowing the animals to survive under the austere nutritional conditions typical of their high-arctic habitat.
Authors:
C G Orpin; S D Mathiesen; Y Greenwood; A S Blix
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  50     ISSN:  0099-2240     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  1985 Jul 
Date Detail:
Created Date:  1985-09-16     Completed Date:  1985-09-16     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  144-51     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animal Feed
Animals
Arctic Regions
Bacteria / growth & development*,  isolation & purification,  metabolism
Cellulose / metabolism
Euryarchaeota / growth & development,  isolation & purification,  metabolism
Female
Fungi / isolation & purification
Gram-Negative Anaerobic Bacteria / metabolism
Hydrogen-Ion Concentration
Lactose / metabolism
Male
Plants, Edible
Proteins / metabolism
Reindeer / metabolism,  microbiology*
Rumen / microbiology*,  physiology
Seasons
Starch / metabolism
Streptococcus / growth & development,  isolation & purification,  metabolism
Urea / metabolism
Xylose / metabolism
Chemical
Reg. No./Substance:
0/Proteins; 0/Xylose; 57-13-6/Urea; 63-42-3/Lactose; 9004-34-6/Cellulose; 9005-25-8/Starch
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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