Degradation of Tyrosine in Anaerobically Stored Piggery Wastes and in Pig Feces

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Abstract
Radioactively labeled compounds that might be intermediates in the anaerobic degradation of tyrosine [and which may be responsible for the bad odor of piggery wastes] were added to pig feces and to stored piggery wastes. Changes in the compounds were followed using TLC and gas chromatography. In feces, p-cresol and 3-phenylpropionic acid were the end products of tyrosine metabolism; in anaerobically stored mixed wastes, phenol, p-cresol and minor quantities of phenylpropionic acid were formed. Schemes were proposed for the degradation of tyrosine in pig feces and in mixed wastes.