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Analýza vybraných jakostních parametrů mléka u dvou plemen skotu v průběhu roku
Životská, Hana
This diploma thesis is focused on the analysis of selected quality parameters of milk from two breeds of dairy cattle during a year. The literary review contains the information about the basic structure of cow's milk and with a more detailed focus on ingredients, which were observed in this thesis (proteins, fat, lactose, chlorides and somatic cells). In addition, the information was also included on basic milk quality indicators and the information about breeds of dairy cattle from which came samples of milk. Samples for analysis came from dairy cows of Czech Fleckvieh breed (farm GenAgro Ricany, a.s.) and from dairy cows of Holstein breed (University farm Zabcice). Samples of milk were obtained during 4 seasons, namely from January 6th 2017 to December 7th 2017. Analysis of variance (ANOVA) showed that the content of the milk observed components is influenced besides else factors, also by the season (in the winter protein content achieved values on averaged 3,31 % and 3,19 % in the summer). Moreover, a significant negative correlation coefficient was detected between proteins and somatic cell count (r = -0,73) and between lactose and somatic cell count (r = -0,45). Overall results showed that all milk samples meet the quality limits (proteins ≥ 2,8 %, fat ≥ 3,3 %, SCC ≤ 400 103.ml-1).
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Vztah mezi obsahem vápníku, složením a technologickými vlastnostmi mléka krav v průběhu roku
Životská, Hana
This bachelor thesis is focused mainly on summary of calcium content, composition and technological properties of cow milk during a year. Into the literary review were given the information about the cow's milk and its structure and of its characteristics, which were observed in this work. Samples for laboratory analysis were obtained from cows of Holstein breed, namely from University Farm in Žabčice. These samples were collected during the whole year (from October 29th 2014 to July 28th 2015). Measured values of selected parameters were evaluated and processed into tables and graphs. Statistically verified results indicates that the content of the monitored components of milk and its technological characteristics besides other factors also the season (in the summer calcium content achieved values on averaged 1,18 g/l and 1,28 g/l in the winter). Moreover, it was demonstrated a positive correlation dependence, between protein and calcium (r = 0,36), protein and density (r = 0,88) or between lactose and density (r = 0,95) for instance.
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