01278naa a2200217 a 450000100080000000500110000800800410001910000190006024501300007926000090020952006820021865000180090065000090091865000110092765000200093865000110095865000110096965300110098070000200099177300490101117860841995-09-12       1943    bl ---       0--  u    #d1 aPEARSON, R. M.  aThe utilization of urea in the bovine rumen. 1. Methods of analysis of the rumen ingesta and preliminary experiments in vivo.  c1943  a1. The relative merits of trichloroacetic acids, sodium tungstate with H2SO4 and alcohol have been compared as pricipitants in the estimation of N.P.N. in rumen ingesta. 2. A description is given of the methods finally adopted for the estimation of N.P.N., and NH3. 3. The heterogeneous nature of the rumen contents is described and illustrated by analy- ses. 4. The difficultiues involved in the interpretation of the results obtained by in vivo experi- ments are discussed. 5. Owing to these difficulties, the results of in vivo experiments of this type cannot be regarded as supplying evidence either for or against the theory that urea is converted to protein in the rumen.  adigestibility  aurea  aBovino  aDigestibilidade  aRúmen  aUréia  aBovine1 aSMITH, J. A. B.  tBiochemistry Journalgv.37, p.142-148, 1943.