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Dock (Rumex obtusifolius) is commonly regarded as a weed, but it prevents bloat in cattle and the condensed tannins (CT) in dock are able to reduce the viability of gastrointestinal parasite eggs and larvae under in vitro conditions. These benefi ts, with other attributes of CT from a variety of forages promoted this study to examine effects of CT extracted from dock on the growth of fi ve strains of proteolytic rumen bacteria in vitro. Streptococcus bovis NCFB 2476, Eubacterium sp. C124b, Prevotella bryantii B14, Butyrivibrio fi brisolvens H17c and Clostridium proteoclasticum B316T were tested against 200, 400 and 600 μg CT/ml. In the absence of CT, all bacterial strains showed typical growth and reached maximum optical density (OD 600 nm) after 6 8 h of incubation at 390C. All strains continued to grow in the presence of 200 μg of the CT from dock per ml but attained signifi cantly lower (P<0.001) OD 600 nm values than their counterparts in the control incubation. The addition of 400 and 600 μg CT/ml reduced (P<0.001) the growth of all bacterial strains tested compared to controls. All strains except P. bryantii did not initiate growth after the addition of 600 μg/ml relative to the growth before addition of CT. C. proteoclasticum was the most sensitive to the action of CT followed by B. fi brisolvens, S. bovis, Eubacterium sp. and P. bryantii. These results suggest that the dock CT have the ability to modify the growth of rumen proteolytic bacteria either directly or indirectly by preventing access to the protein.

The impact of condensed tannins from dock (Rumex obtusifolius) on the growth of rumen proteolytic bacteria in vitro