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Why does the increase of plasmin worsen the coagulation properties of milk in dairy sheep?

Battacone, Gianni and Cannas, E. A. and Mazzette, Alessandro and Dimauro, Corrado and Enne, Giuseppe (2005) Why does the increase of plasmin worsen the coagulation properties of milk in dairy sheep? Italian Journal of Animal Science, Vol. 4 (Suppl. 2), p. 342-344. eISSN 1828-051X. Article.

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Abstract

The concentrations of whole casein and fat are the factors which play the most important role in determining the cheese-making qualities of milk. Plasmin (PL) is the main proteolytic enzyme in milk and has been found to be associated with enhanced casein hydrolysation. ß-casein is the most susceptible to breakdown by this enzyme. Most of the enzyme is in the form of the inactive zymogene plasminogen (PG), which is converted to PL by the action of PG activators. PL activity is also associated with alteration of mammary epithelium permeability and a subsequent increase in paracellular flow. These proteolytic activities worsen the milk quality, coagulation properties and cheese yield. The level of PL in milk increases towards the end of lactation, with mastitis, and with the increasing age of the animals. At present the relationship between PL, SCC and casein are not clearly defined. Some authors found positive relationships between PL and SCC with CN (Baldi et al., 1996; Bianchi et al., 2004), others negative (Fantuz et al., 2001), and some have found no relationship (Albenzio et al., 2004). The aim of this work was to study why milk with higher PL content has worse coagulation properties.

Item Type:Article
ID Code:942
Status:Published
Refereed:Yes
Uncontrolled Keywords:Plasmin, milk, coagulation properties, sheep, Sardinia
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/19 Zootecnica speciale
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze zootecniche
002 Altri enti e centri di ricerca del Nord Sardegna > Istituto zooprofilattico sperimentale della Sardegna, Sassari
Publisher:Avenue media on behalf of Scientific Association of Animal Production (ASPA)
eISSN:1828-051X
Publisher Policy:Depositato per gentile concessione dell'ASPA
Additional Information:Relazione al 16. Congresso nazionale ASPA, Torino, 28-30 giugno 2005.
Deposited On:18 Aug 2009 10:03

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