The glutamic acid and creatine content of cock seminal plasma

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Abstract
Free glutamic acid in a concentration of about 1 g/100 ml has been chro-matographically identified in the seminal plasma of the domestic cock. Small amounts of alanine, aspartic acid, glycine, serine and an unidentified ninhydrin-reacting substance have also been detected. About 100 mg of creatine/100 ml is also present. About 80% of the seminal plasma non-protein nitrogen is accounted for by glutamic acid plus creatine. It is probable that these substances are mainly of testicular origin and that the glutamic acid plays a major part in maintaining the osmotic pressure and pH.