Counts of psychrotrophic lipolytic bacteria in cow’s raw milk samples from the aspect of technological quality

To chci

The objective of the study was to analyze the relationship of psychrotrophic lipolytic bacteria in milk with the level of free fatty acids as an indicator of technological quality of milk on dairy farms with different management technology. The contamination of bulk samples of cow’s raw milk (n=110) by psychrotrophic lipolytic bacteria (PLiBC) and total counts of psychrotrophic bacteria (PBC) and mesophilic bacteria (TBC) were determined by a culture method in accordance with IDF standards. The content of free fatty acids (FFA) was determined by an extraction-titration method and somatic cell count (SCC) was determined by flow cytometry with fluorescence detection. The study was conducted throughout 2008 on 11 farms with different management technology (5 farms with loose littered cubicle housing with milking in a milking parlour; 3 farms with loose litterless slatted-floor housing with milking in a milking parlour; 3 farms with stanchion littered housing with an in-stall milking pipeline system). The correlation of PLiBC with FFA content was low (r=0.03; NS) and the correlation of SCC with FFA was similar (r=0.047; NS). The average FFA value of 32 mmol/kg fat was on the limit of the permissible maximum content for FFA for the extraction-titration method. However, a statistically significant relationship of FFA content with the technology of stanchion housing with the in-stall milking pipeline system was proved where the highest average values of FFA and PLiBC were determined (42 mmol/kg fat and 1,935 CFU/ml – log 2.86; respectively) compared to loose littered cubicles (23 mmol/kg fat and 598 CFU/ml – log 2.58; respectively) and loose litterless slatted-floor housing with milking in a milking parlour (30 mmol/kg fat and 1,339 CFU/ml – log 2.84; respectively). … celý popis

Podrobná bibliografie

Hlavní autor

Růžena Cempírková, 1945-

Další autoři

Magda Mikulová
Jan Trávníček, 1954-

Typ dokumentu

Články

Fyzický popis

6 il.

Publikováno v

Journal of Agrobiology. -- ISSN 1803-4403. -- Roč. 26, č. 2 (2009), s. 113-121

Témata

CATTLE

DAIRY COWS

COW MILK

MICROBIOLOGICAL ANALYSIS

CELL COUNTING

BACTERIA

PSYCHROPHILIC MICROORGANISMS

FREE FATTY ACIDS

SOMATIC CELL COUNT

PROCESSING QUALITY

lipolytické mikroorganismy

skot

dojnice

kravské mléko

mikrobiologická analýza

počítání buněk

baktérie

psychrofilní mikroorganismy

volné mastné kyseliny

počet somatických buněk

zpracovatelská kvalita

Popis jednotky

3 grafy, 3 tabulky

Bibliografie

Literatura na s. 117-118