Comparison of plant secondary metabolites and digestibility of three different boreal coniferous trees
2009
Stolter, Caroline | Ball, John P. | Julkunen-Tiitto, Riitta | Vanhatalo, Aila | Danell, Kjell | Varvikko, Tuomo | Ganzhorn, Jörg U.
Moose (Alces alces L.) prefer to browse Pinus sylvestris over other coniferous trees. One reason for this preference might be due to differences in the chemical composition of various coniferous plants, and/or differences in digestibility. We evaluated the in-sacco digestibility of P. sylvestris, Pinus contorta and Picea abies using a fistulated cow (Bos taurus). Additionally, we determined the chemical profile of the different plant species (with emphasis on specific phenolics) and we modified the concentration of the individual phenolic (+)catechin in plant material of P. sylvestris to test the influence of this particular phenolic on digestibility in vitro (IVDMD). The in-sacco experiment revealed the highest digestibility of dry matter, and neutral detergent fibre for P. sylvestris. In addition, the concentration of nitrogen was significantly higher, and the concentrations of total phenolics and condensed tannins were significantly lower in P. sylvestris than in the other species. Individual phenolics showed high variation but were low in P. sylvestris, whereas P. contorta and P. abies had at least one species-specific phenolic compound of high concentration each. We found no changes in the digestibility of samples in which we experimentally elevated (+)catechin content.
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