Goats were used in a trial to investigate the rate of 15N incorporation from labelled urea into the basic amino acids of the milk (excess of 15N = 24.9 atom%). As early as 20 minutes after administration of the first dose of 15N urea nitrogen labelling in arginine and lysine was observed. The highest level of 15N labelling was noticed for lysine and arginine 24 hrs after start of the trial. The peak values of labelling for histidine were essentially lower. Reference is made to peculiarities of the ruminal metabolism of histidine.

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