The microbiological quality of raw milk from the perspective of the health of dairy products is one of the most important features. The amount of microorganisms is influenced by storage temperature and time of milk. In the thesis was observed dynamics of total bacteria count (TBC) in raw milk depending on the selected factors (months, seasons, point of collection, the length of storage). To life of microorganisms contributes warm weather. The largest increase in TBC was observed in the months of April and May to 108 thousand /1 Ml. It is necessary to place great emphasis on rapid cooling of milk (max 150 min.) to the desired temperature (8 °C). Increase TBC could be caused by long transportation time of sampling raw milk from a milk vending machine to evaluate the quality and microbiological indicators. In the second part of the thesis are compares the quality and microbiological characteristics of raw milk from selected milk vending machines. When evaluating the samples taken from the farm, average values of TBC were higher (43 thousand/ml) compared to samples collected from the milk vending machines (6 thousand/ml). Reason of higher values from farms could be caused by poor hygiene of the milk and his secondary contaminations. In contrast, the average results from samples taken from the milk vending machines were more than excellent. That´s shows tight control of cooling milk during transportation from the farm to the milk vending machine. Next reason better results is right cooling and to maintain a constant temperature in the grades (from 0.5 to 1 °C). That´s temperature, which prevents the growth of microorganisms.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:174208 |
| Date | January 2014 |
| Creators | HAVRÁNKOVÁ, Iveta |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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