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Effects of two tannin extracts at different doses in interaction with a green or dry forage substrate on in vitro rumen fermentation and biohydrogenation

Menci, Ruggero; Coppa, Mauro; Torrent, Angelique; Natalello, Antonio; Valenti, Bernardo; Luciano, Giuseppe; Priolo, Alessandro and Niderkorn, Vincent (2021) Effects of two tannin extracts at different doses in interaction with a green or dry forage substrate on in vitro rumen fermentation and biohydrogenation. Animal Feed Science and Technology, 278, p. 114977.

[thumbnail of Menci et al. 2021 ANIFEE.pdf] PDF - Published Version - English
Available under License Creative Commons Attribution.


Document available online at: https://www.sciencedirect.com/science/article/pii/S0377840121001632


Extensive ruminant farming systems often face fluctuating pasture availability, resulting in two periods with very different forage quality. Tannins are natural bioactive compounds able to modify ruminants’ digestive metabolism thanks to their bioactive properties. To evaluate a differential effect of tannins in different feeding situations, according to the availability of pasture along the year, an in vitro rumen incubation trial was performed. Buffered sheep rumen content was incubated in vitro with two different substrates, vetch pasture (VP) and vetch hay (VH), in the presence of two different tannin extracts, from quebracho (QUE) and a mixture of quebracho and chestnut tannins (MIX). Each of the tannin extract was tested at 0, 15 and 30 g of tannin/kg DM. The gas production was determined at 3.5 and 24 h of fermentation. After 24 h in anaerobic conditions, volatile fatty acids (VFA), ammonia and fatty acids (FA) were analysed. Interesting significative two-way interactions with different tannin extracts were observed in some fermentation parameters. Adding MIX to VH treatment resulted in a higher depression (P < 0.050) of ammonia production and iso-VFA proportions, compared to QUE supplementation, while no differences were observed in VP treatment. QUE was more effective than MIX (P < 0.050) in reducing acetate/propionate ratio when supplemented to VH treatment. However, the MIX treatment showed a higher increase (P < 0.050) of CO2/CH4 ratio after 24 h of incubation when supplemented at 30 g/kg, compared to QUE treatment. MIX and QUE exerted similar effects on rumen biohydrogenation. Tannin extracts decreased the rumenic/linoleic acid ratio and iso-FA proportions (P < 0.050) only when added to the VH treatment. These results demonstrate that tannin extracts are more effective in modulating rumen metabolism when associated with a hay-based diet. Also, the MIX treatment was more effective in protecting proteins from ruminal degradation, a key point in grazing periods. Therefore, extensive husbandry could benefit from different strategies for using dietary tannin extracts according to season and pasture availability.

EPrint Type:Journal paper
Keywords:Hydrolysable tannins, Condensed tannins, Pasture, Hay, Rumen fermentation, Biohydrogenation, ProYoungStock
Agrovoc keywords:
rumen fermentation -> rumen digestion
in vitro
Subjects: Animal husbandry > Feeding and growth
Farming Systems > Farm nutrient management
Research affiliation: European Union > CORE Organic > CORE Organic Cofund > ProYoungStock
France > INRAe - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Italy > Univ. Perugia
Italy > Univ. Catania
Horizon Europe or H2020 Grant Agreement Number:727495
Related Links:https://www.proyoungstock.net/
Deposited By: Menci, Mr. Ruggero
ID Code:40130
Deposited On:07 Jul 2021 12:39
Last Modified:07 Jul 2021 12:39
Document Language:English
Refereed:Peer-reviewed and accepted

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