Técnicas de quantifica？？o da síntese microbiana no rúmen: uma revis？o

the quantification of the microbial protein synthesis in the ruminants is of great importance to assess the nutritional quality of the diets. the determination of microbial synthesis is achieved through the use of microbial markers, which are classified: internal (by-products of rumen microorganisms) and external (substances administered to animals that are incorporated by rumen microorganisms). although some advances has occurred lately an ideal marker still need to be developed. so the objective of this review is to detail each of the techniques for estimating microbial protein synthesis in the rumen, and discuss the results obtained using each technique.