This project deals with the characterisation and establishment of the baseline circulating acellular proteome of sheep serum using generic methods. Serum is a readily available substrate for most experimental and clinical applications as evidenced in recent sheep studies. It involves sample preparation for the optimisation of proteomic profiling of sheep serum. The chapter therefore represents the first step in the development of a proteomics pipeline for the detection protein alterations by first establishing the normal proteomic profile of sheep serum.