ABSTRACT The aim of the thesis was to evaulate and analysis of changes in the amount and composition of cow milk from Holstein dairy cows caused by prolonged lactation.The necessary information regarding the composition of cow's milk and a more detailed description of the milk components (fat, protein, somatic cell, lactose, urea) are included in the literature review. Samples were obtained from Holstein dairy cows from Unčovice Farm and used in our analysis. The samples were collected in the annual period from 7. 3. 2018 to 7. 3. 2019. The sampling was carried out by trained staff from the performance control and number of dairy cows involved in the analysis was 4540 units. The samples were taken for studied parameters (daily milk yield, fat content, protein content, lactose content, urea content and somatic cell count). The results show a large effect of lactation days on daily milk yield and and the content of milk components. Also, the daily milk yield is correlated with the content of milk components. The established results also show the effect of lactation on somatic cell counts but the effect of lactation on the urea content was not found. Furthermore, it was evaluated the frequency of mastitis.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:427745 |
| Date | January 2019 |
| Creators | Čunderle, Jan |
| 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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