[Microbialnd chemical changes of raw milk in various stages of production in industrial dairy farms of Fars province]

ABSTRACT

With aim for Identification of contaminative and critical points of raw milk during production in 9 selected industrial dairy farms, 408 raw milk samples were collected from udders, milking machine, cooling tank and milk transport vehicle at receiving platform in dairy plant. Samples were examined for total microbial, coliform and E.coli count and also acidity and pH. Total microbial count of Samples was significantly lower in udders than the later stages [p<0.001]. Coliform count of Samples increased significantly from udders to cooling tank and milk transport vehicle at receiving platform in dairy plant [p<0.05]. There were no significant differences, [p>0.05] among the E. coli count at the different stages. High total microbial count in udder milk samples and significantly increase of this factor and acidity in milking, machine stage imply to localize executive, educational and investigative activity on this crisis points