Nitrogenous substances in udder lymph and plasma of cattle

¹ State Agricultural University, Ghent, Belgium

Urea and uric acid were determined chemically and 10 amino acids chromatographically in udder lymph and plasma of the udder veins of cattle. From the results, it appears that urea occurs in the same concentration in the two fluids while uric acid and each of the 10 amino acids are considerably higher in the lymph than in the plasma. As a percentage of total amino nitrogen however, glycine and tyrosine occur in a significantly (P = 0.01) lower concentration in lymph than in plasma, while the reverse is true for the leucines, lysine and also for threonine, but only at P = 0.05 for the latter. Highly significant correlations have been established between glycine, leucines and valine in lymph and in plasma.