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ESTIMATION OF RUMEN MICROBIAL-NITROGEN OF SHEEP USING URINARY EXCRETION OF PURINE DERIVATIVES Nitrogen metabolism in sika deer on a low protein diet supplemented with lysine and methionine Response of urinary purine derivatives excretion to yeast RNA infusion levels in the yak abomasum Effect of selenium methionine on rumen fermentation and purine derivatives in Simmental steer