Journal Article


Charles J Newbold
Alessandro Priolo
Eleanor Jones
Joseph P Kerry
Giuseppe Luciano
Michael N O'Grady
Marco Bella
Bernardo Valenti
Saheed A Salami


Agriculture & Food Science

influence diet antimicrobial activity fungi communities sources fermentation tannins

Characterization of the ruminal fermentation and microbiome in lambs supplemented with hydrolysable and condensed tannins. (2018)

Abstract This study characterised the response of ruminal fermentation and the rumen microbiome in lambs fed commercial vegetal sources of hydrolysable tannins (HT) and condensed tannins (CT). Forty-four lambs (19.56 ± 2.06 kg) were randomly assigned to either a concentrate diet (CON, n = 8) or CON supplemented with 4% of two HT [chestnut (Castanea sativa, HT-c) and tara (Caesalpinia spinosa, HT-t)] and CT [mimosa (Acacia negra, CT-m) and gambier (Uncaria gambir, CT-g)] extracts (all, n = 9) for 75 days pre-slaughter. Tannin supplementation did not influence ruminal fermentation traits. Quantitative PCR demonstrated that tannins did not affect the absolute abundance of ruminal bacteria or fungi. However, CT-m (-12.8%) and CT-g (-11.5%) significantly reduced the abundance of methanogens while HT-t (-20.7%) and CT-g (-20.8%) inhibited protozoal abundance. Ribosomal amplicon sequencing revealed that tannins caused changes in the phylogenetic structure of the bacterial and methanogen communities. Tannins inhibited the fibrolytic bacterium, Fibrobacter and tended to suppress the methanogen genus, Methanosphaera. Results demonstrated that both HT and CT sources could impact the ruminal microbiome when supplemented at 4% inclusion level. HT-t, CT-m and CT-g extracts displayed specific antimicrobial activity against methanogens and protozoa without compromising ruminal fermentation in a long-term feeding trial.
Collections Ireland -> University College Cork -> PubMed

Full list of authors on original publication

Charles J Newbold, Alessandro Priolo, Eleanor Jones, Joseph P Kerry, Giuseppe Luciano, Michael N O'Grady, Marco Bella, Bernardo Valenti, Saheed A Salami

Experts in our system

Eleanor Jones
National University of Ireland Galway
Total Publications: 5
J P Kerry
University College Cork
Total Publications: 130
M N O'Grady
University College Cork
Total Publications: 23