Document Detail

Studies on the effects of selenium on rumen microbial fermentation in vitro.
MedLine Citation:
PMID:  9164665     Owner:  NLM     Status:  MEDLINE    
The effects of selenium (Se) on ruminant microbial fermentation were investigated in vitro using rumen microflora collected from a rumen-fistulated dairy cow. First, the effects of L-selenomethionine (SeMet; at 0.2 or 2 ppm Se) in the presence or absence of wheat bran (WB, 500 mg per incubation flask) were evaluated. Second, the effects of several forms of Se (elemental Se: 50 ppm Se; sodium selenite: 2 ppm Se; SeMet: 2 ppm Se) were compared. Results showed that the amounts of short-chain fatty acids (SCFAs) tended to be increased by SeMet treatment, whereas SeMet in the presence of WB transiently suppressed fermentation. The addition of SeMet tended to increase the production of acetate while reducing the production of butyrate with the without WB supplementation. Among the different Se compounds tested, the amounts of SCFAs were greater with SeMet treatment, which yielded a higher proportion of acetate compared to other treatments. Selenite did not influence the total SCFAs concentrations; however, it increased the relative proportion of butyrate at the expense of acetate. Elemental Se did not significantly affect fermentation. Higher bacterial Se concentrations were observed for selenite than for SeMet. It was concluded that Se supplementation can influence rumen microbial fermentation and that Se compounds differ in this regard.
J Kim; P J Van Soest; G F Combs
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Biological trace element research     Volume:  56     ISSN:  0163-4984     ISO Abbreviation:  Biol Trace Elem Res     Publication Date:  1997 Feb 
Date Detail:
Created Date:  1997-07-10     Completed Date:  1997-07-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7911509     Medline TA:  Biol Trace Elem Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  203-13     Citation Subset:  IM    
Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853, USA.
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MeSH Terms
Acetic Acid / chemistry
Butyric Acid
Butyric Acids / chemistry
Dietary Fiber / analysis
Fatty Acids, Nonesterified / chemistry
Fermentation / drug effects*
Propionic Acids / chemistry
Rumen / drug effects*,  metabolism,  microbiology*
Selenium / metabolism,  pharmacology*
Selenomethionine / metabolism,  pharmacology
Sodium Selenite / metabolism,  pharmacology
Reg. No./Substance:
0/Butyric Acids; 0/Fatty Acids, Nonesterified; 0/Propionic Acids; 10102-18-8/Sodium Selenite; 107-92-6/Butyric Acid; 1464-42-2/Selenomethionine; 64-19-7/Acetic Acid; 7782-49-2/Selenium; 79-09-4/propionic acid

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

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