摘要：Several methods are currently employed to manipulate rumen fermentation to enhance post-ingestion nutritive value of fibrous forages through use of biotechnology including inoculants of native and recombinant rumen microorganisms, natural adaptation and microbial feed enzymes. In this essay, progress and problems related to manipulation of rumen ecosystem through inoculation of natural and genetically modified rumen microorganisms are discussed. Also advancements in exogenous fibrolytic enzymes to improve digestibility of fibrous diets is briefly reviewed.
