Live yeasts enhance fibre degradation in the cow rumen through an increase in plant substrate colonization by fibrolytic bacteria and fungi

• Published in: Journal of applied microbiology Vol. 120; no. 3; pp. 560 - 570
• Main Authors: Chaucheyras‐Durand, F, Ameilbonne, A, Bichat, A, Mosoni, P, Ossa, F, Forano, E
• Format: Journal Article
• Language: English
• Published: England Published for the Society for Applied Bacteriology by Blackwell Science 01.03.2016; Oxford University Press; Wiley
• Subjects: alfalfa hay; Animal Feed - analysis; Animal Feed - microbiology; Animals; Bacteria; Bacteria - growth & development; Bacteria - metabolism; Biodegradation; Biotechnology; Butyrivibrio fibrisolvens; Cattle; cows; Dietary Fiber - metabolism; Dietary Supplements - analysis; Digestion; feed conversion; fibre degradation; Fibrobacter succinogenes; Fungi - growth & development; Fungi - metabolism; Glycine max - metabolism; Glycine max - microbiology; hulls; Life Sciences; live yeasts; microbial biomass; microbial colonization; Microbiology; Microbiology and Parasitology; micro‐organisms; neutral detergent fiber; oxygen; qPCR; quantitative polymerase chain reaction; Real-Time Polymerase Chain Reaction; rumen; Rumen - metabolism; Rumen - microbiology; rumen fermentation; Ruminococcus flavefaciens; Saccharomyces cerevisiae; silage; Silage - analysis; Silage - microbiology; Substrates; Triticum - metabolism; Triticum - microbiology; Triticum aestivum; wheat; wheat bran; Yeast; yeasts; Yeasts - growth & development; Yeasts - metabolism; live yeasts; qPCR; rumen; fibre degradation; micro-organisms
• ISSN: 1364-5072; 1365-2672
• DOI: 10.1111/jam.13005

AIMS: To monitor the effect of a live yeast additive on feedstuff colonization by targeted fibrolytic micro‐organisms and fibre degradation in the cow rumen. METHODS AND RESULTS: Abundance of adhering fibrolytic bacteria and fungi on feedstuffs incubated in sacco in the cow rumen was quantified by qPCR and neutral detergent fibre (NDF) degradation was measured. Saccharomyces cerevisiae I‐1077 (SC) increased the abundance of fibre‐associated Fibrobacter succinogenes on wheat bran (WB) and that of Ruminococcus flavefaciens on alfalfa hay (AH) and wheat silage (WS). The greatest effect was observed on the abundance of Butyrivibrio fibrisolvens on AH and soya hulls (SH) (P < 0·001). Fungal biomass increased on AH, SH, WS and WB in the presence of SC. NDF degradation of AH and SH was improved (P < 0·05) with SC supplementation. CONCLUSIONS: Live yeasts enhanced microbial colonization of fibrous materials, the degree of enhancement depended on their nature and composition. As an effect on rumen pH was not likely to be solely involved, the underlying mechanisms could involve nutrient supply or oxygen scavenging by the live yeast cells. SIGNIFICANCE AND IMPACT OF THE STUDY: Distribution of this microbial additive could be an interesting tool to increase fibre digestion in the rumen and thereby improve cow feed efficiency.