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The purpose of this study was to determine the neutralising effect of Browse Plusâ„¢ on condensed tannins in a sole diet of Leucaena forage and how that affected feed intake, rumen environment and passage of nutrients. Partial digestion methods were used. Results showed that the use of Browse Plusâ„¢ had a significant (P < 0.05) effect on some parameters. It increased the daily feed intake by 32%, and it raised the production of rumen ammonia and volatile fatty acids by 65.6% and 19.4%, respectively. However, Browse Plusâ„¢ did not affect the rumen environment and the proportions of volatile fatty acids significantly (P < 0.05). We concluded that Browse Plusâ„¢ had a significant (P < 0.05) effect on rumen protein degradation, while the combined effect of Browse Plusâ„¢ and Synergistes jonesii bacteria prevented both mimosine and condensed tannin toxicity, which resulted in more efficient rumen fermentation and absorption of nutrients in the small intestines.