259-1 Bioactive Tannins in Forage Legumes: Myths, Ignorance and Aspirations.

See more from this Division: C06 Forage and Grazinglands
See more from this Session: Symposium-- the Value of Condensed Tannins in Forages

Tuesday, November 17, 2015: 1:35 PM
Hilton Minneapolis, Minneapolis Ballroom B

Irene Mueller-Harvey1, Aina Ramsay2, Christos Fryganas2, Honorata Ropiak2, Chris Drake2, Marina Mora Ortiz3, Lydia M.J. Smith3, Leif Skot4, Carsten Malisch5, Andreas Luescher6, Katharina Kempf7, Roland Kolliker8, Olivier Desrues9, Andrew R. Williams9, Stig M. Thamsborg9, Blasius N. Azuhnwi10, Jessica N. Quijada10, Hervé Hoste11, Marion Girard12, Anja Grosse Brinkhaus12, Frigga Dohme-Meier12, Giuseppe Bee13, Njuyen T Huyen14, Wilbert F. Pellikaan14, Giuseppe Copani15, Vincent Niderkorn15, Marica Engstrom16, Juha-Pekka Salminen17, Ian Wilkinson18, Paul Totterdell18 and Garry Waghorn19, (1)School of Agriculture, Policy and Development, University of Reading, Reading, UNITED KINGDOM
(2)SAPD, University of Reading, Reading, United Kingdom
(3)NIAB, Cambridge, United Kingdom
(4)IBERS, University of Aberystwyth, Aberystwyth, United Kingdom
(5)Agroscope, Zurich, SWITZERLAND
(6)Agroscope, Zurich, Switzerland
(7)ISS, Agroscope, Zuerich, Switzerland
(8)Agroscope Institute for Sustainability Sciences, Zurich, Switzerland
(9)Department of Veterinary Disease Biology, University of Copenhagen, Frederiksberg C, Denmark
(10)UMR1225 IHAP, INRA, Tolouse, France
(11)INRA, Toulouse, France
(12)Institute for Livestock Sciences, Agroscope, Posieux, Switzerland
(13)Agroscope, Posieux, Switzerland
(14)Wageningen Institute of Animal Sciences, Wageningen University, Wageningen, Netherlands
(15)UR1213 Herbivores, INRA, St-Genès-Champanelle, France
(16)Department of Chemistry, University of Turku, Turku, Finland
(17)University of Turku, Turku, Finland
(18)Cotswold Seeds Ltd, Moreton-in-Marsh, United Kingdom
(19)DairyNZ, Hamilton, New Zealand


Tannin-containing legumes have attracted much interest due to their animal health and nutritional benefits. Although several tannins are anti-nutritional, a few can generate valuable benefits for controlling parasitic nematodes that are resistant to anthelmintic drugs, for improving protein utilization by ruminants and fatty acid profiles in meat and milk products and for reducing greenhouse gases. A 5% dietary maximum limit of tannins has been suggested, but information on structure-activity relationships are essential in order to fully exploit the potential of these natural plant compounds. Breeders also require guidelines and screening tools for optimal tannin compositions, and farmers require tannin-containing forages that provide consistent results.

Plants vary in tannin contents and composition depending on species, variety and growing conditions. Recent research in Europe (‘LegumePlus' and other projects) has focused on new tools for analyzing soluble and insoluble tannins in plants, silages and digesta. This involved isolating different types of tannin standards from a wide range of different plants and thiolysis to assess their purity and composition. We also developed new UPLC-MS/MS, NIR- and NMR-analysis methods and tested tannin-protein interactions. Agronomists and plant breeders assembled germplasm collections, identified sainfoin-specific markers, and strategies for weed control. Ruminant nutritionists studied in vitro and in vivo fermentations, N-balances and the quality of meat and milk products. Parasitologists explored the anti-parasitic properties using a wide range of different tannin types.

The presentation will summarize current knowledge and conclude with a wishlist for ‘ideal' tannin-containing forages. It will emphasize that robust and stable tannin concentrations and compositions are required in addition to high yield, good weed suppression and resistance to climatic stress.

See more from this Division: C06 Forage and Grazinglands
See more from this Session: Symposium-- the Value of Condensed Tannins in Forages