Contamination of cow's raw milk by psychrotrophic and mesophilic microflora in relation to selected factors
2006
Cempirkova, R.,Jihoceska Univ., Ceske Budejovice (Czech Republic). Zemedelska Fakulta
The objective of the paper was to analyse the influence of dairy cow management technology, milking method, predipping and summer grazing on the contamination of cow's raw milk by mesophilic (TBC), psychrotrophic (PBC), lipolytic (PLiBC) and proteolytic (PPrBC) bacteria. The values of TBC, PBC, PLiBC and PPrBC in bulk milk samples were determined by the culture method according to IDF standards. Investigations were carried out in nine stables of seven dairy farms from January 2005 to June 2006. Summer grazing had the most marked influence on the values of the studied variables. Farms with summer grazing had significantly lower microbial contamination of milk than farms without grazing. A positive effect of predipping was observed. A comparison of the influence of dairy cow management technology indicated the lowest values of all microbiological indicators in loose cubicle littered housing, higher values were determined in stanchion littered housing and the highest in loose slatted-floor housing. Milking in milking parlours led to lower microbial contamination than milking pipeline system, but the difference was significant only in TBC.
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