Title: TRYPTOPHAN UTILIZATION BY RUMEN MICROORGANISMS IN VITRO
Abstract: A continuous flow, artificial rumen apparatus was used to investigate the utilization of DL-tryptophan– 14 C(U)–benzene ring labelled material by rumen microorganisms. Half of the labelled material left the rumen sac in the first six hours. After a 24-hour period, less than 4% of the label was associated with either the protozoal or the bacterial fraction of the rumen fluid.