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The experiment was conducted to determine the effect of dried Leucaena (DL) supplementation levels on rumen ecology,nutrient digestibility and urinary excretion of 2,3-dihydroxy pyridone (2,3- DHP) and 3,4-dihydroxy pyridone (3,4-DHP) in swamp buffaloes (Bubalus Bubalis) fed on rice straw.