Changes in milk plasminogen, plasmin andin vitrobacterial growth in whey during early lactation

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Abstract
Summary: The activity of milk plasmin, plasminogen andN-acetyl-β-glucosaminidase (NAGase) and the trypsin-inhibitor capacity (TIC) were monitored in 40 quarters during the first month of lactation. TIC and NAGase activity decreased rapidly and plasmili activity more slowly during the first week. Conversely milk plasminogen increased as time elapsed from parturition. When the quality of whey was analysed as a growth medium for mastitis pathogens, a slight inhibition in the growth ofEscherichia coli, Staphylococcus aureusandStreptococcus agalactiaewas seen at the day of parturition. There was a distinct stimulatory effect on the growth ofStr. agalactiaeduring the second week of lactation. No relationship was found betweenin vitrobacterial growth and respective plasmin or plasminogen activity in milk.