scholarly journals Effect of a Saccharomyces cerevisiae culture on growth and lactate utilization by the ruminal bacterium Megasphaera elsdenii

1995 ◽  
Vol 44 (4) ◽  
pp. 403-409 ◽  
Author(s):  
F. Rossi ◽  
PS Cocconcelli ◽  
F. Masoero
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Ruminal Bacterium ◽  
Megasphaera Elsdenii ◽  
Lactate Utilization

scholarly journals Effects of peptidic fractions from Saccharomyces cerevisiae culture on growth and metabolism of the ruminal bacteria Megasphaera elsdenii

2004 ◽  
Vol 53 (3) ◽  
pp. 177-186 ◽  
Author(s):  
Filippo Rossi ◽  
Aldo Di Luccia ◽  
Donatella Vincenti ◽  
Pier Sandro Cocconcelli
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Ruminal Bacteria ◽  
Megasphaera Elsdenii

Effects of a strain of Saccharomyces cerevisiae (Levucell® SC), a microbial additive for ruminants, on lactate metabolism in vitro

1996 ◽  
Vol 42 (9) ◽  
pp. 927-933 ◽  
Author(s):  
Frédérique Chaucheyras ◽  
Gérard Fonty ◽  
Philippe Gouet ◽  
Gérard Bertin ◽  
Jean-Michel Salmon
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Amino Acids ◽  
Lactate Concentration ◽  
Lactate Production ◽  
Yeast Cells ◽  
Strictly Anaerobic ◽  
Streptococcus Bovis ◽  
Lactate Metabolism ◽  
Megasphaera Elsdenii

The effect of Levucell® SC, a strain of Saccharomyces cerevisiae marked as a feed additive for ruminants, was investigated in vitro on lactate metabolism by the ruminal bacteria Streptococcus bovis and Megasphaera elsdenii. The coculture between 107 live cells∙mL−1 of SC and a Streptococcus bovis strain in the presence of glucose reduced lactate production by the bacterial strain. Live yeast cells were able to compete with Streptococcus bovis for glucose utilization in strictly anaerobic conditions, so less glucose was available for the bacterium. SC also stimulated L-lactate utilization by a strain of M. elsdenii. The effect depended on the concentration of yeast cells added. Bacterial growth and fermentation end-product concentrations were also increased in the presence of SC. Some amino acids and vitamins, but not dicarboxylic acids, stimulated the bacterial specific activity of L-lactate uptake. SC was able to provide amino acids to M. elsdenii. In a coculture of Streptococcus bovis and M. elsdenii on glucose, the reduction of lactate concentration was improved by SC, the same trend being observed when maltose or soluble starch were used as carbon and energy source. These results indicate that SC can be a very useful tool to reduce lactate accumulation in vitro during fermentation of soluble sugars.Key words: rumen, Saccharomyces cerevisiae, lactate metabolism, Streptococcus bovis, Megasphaera elsdenii.

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