Valutazione del sistema PL-PG-PA quale indicatore della qualità del latte bovino

Somatic cell count is used as indicator of quality of milk. Most frequently an increase of SCC reflects an immune response related to intramammary infections. Plasmin-plasminogen-plasminogen activator (PL-PG-PA) is an enzymatic system activated during inflammation. The aim of this work is to evaluate PL-PG-PA system in relation to quality of milk. We determined SCC and bacterial flora on milk samples collected from 114 cows aseptically. We selected and divided samples in two groups: G1carachterized of SCC<100.000 cells/ml, absence of pathogens and G2 with SCC800.000 cells/ml. We evaluated the PL-PG-PA activity with enzymatic and colorimetric assay. The results of this study showed higher levels of PL and PA activity in G2 (P<0.001) and positive correlations between SCC vs PL and SCC vs PA (P<0.001).