Quantitative Determination of the Amino Acid Content of Rumen Fluid from Twin Steers Fed Soybean Oil Meal or Urea

Abstract

Two pairs of fistulated identical twin steers were used to compare, by column chromatography, 19 amino acids in rumen fluid after feeding urea or soybean oil meal. Steers supplemented with soybean oil meal synthesized a greater amount of all amino acids than steers fed urea.