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Mléčný tuk a jeho využití v potravinářských technologiích
Nejedlíková, Martina
This bachelor thesis deals with milk fat and its use in dairy technology. The composition of milk is summarized and the knowledge regarding milk fat, its structure and properties is presented in details. Part of the thesis is devoted to methods of treatment and fractionation of milk fat. The findings regarding the studies of the antibacterial activity of lactose monolaurate ester (LML) and lactose monodecanoate (LMD) in milk at different temperatures and fat contents are summarized. Furthermore, the research trend of using milk fat in 3D food printing is presented, which offers new opportunities in the field of food design and customization. Overall, milk fat has significant applications in dairy technology and research trends in its use provide exciting opportunities for the development of the food industry.
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Mastné kyseliny v ovčím mléce
Horáková, Klára
The bachelor's thesis discusses the contents of fatty acids in sheep's milk as well as their domestication, tracking their numbers in the Czech Republic and the composition of sheep's milk. Furthermore, fatty acids and their content in sheeps milk and factors influencing their concentration are defined here. The aim of this thesis is to evaluate the contents and composition of fatty acids in sheep's milk according to available information from both technical and scientific literature. The work is divided into two main parts. The first part discusses the developments in sheep breeding in our country, the composition of sheep's milk and fatty acids and their representation in sheep's milk. The final part of the bachelor's thesis is dedicated to individual studies concerning sheep's milk and its fatty acid content.
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Zhodnocení vybraných ukazatelů složení mléka v průběhu laktace u ovcí plemene cigája
Bartoň, Petr
This master’s thesis evaluates selected indicators of the quality of sheep milk and its components. The sheep of the selected Tsigai breed are bred in the northern part of Zapadni Tatry in Slovakia. As a part of the thesis pool samples of sheep milk were collected at periodic intervals. The pool samples were collected on the average 45th, 75th, 105th, 135th, 165th, 195th, and 225th day of the lactation period. A group of Improved Wallachian breed sheep was added to the experiment for comparison. The milk of the Tsigai breed contained on average 20.03 % of dry matter, 8.14 % of milk fat, 6.38 % of proteins, 4.70 % of lactose, and 63.86 mg/100 ml of urea. The following physicochemical traits were assessed: active acidity, titratable acidity, and a freezing point of the milk. The average value of active acidity was 6.55, of titratable acidity 9.2 °SH, and of the freezing point -0,576 °C. The last sample surprisingly contained a low amount of lactose, however, the most surprising finding was an extremely low amount of somatic cell count at the end of the lactation period. Ascertained correlations correspond with the available papers and do not differ significantly. The acquired results for the Tsigai breed are comparable with the comparison breed of Improved Wallachian.
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Výskyt ketóz ve vybraném chovu dojených krav v letech 2020-2022
ŠTĚCHOVÁ, Petra
Ketosis is a disorder of energy metabolism characterised by reduced milk yield, inappetence and weight loss. Ketosis also affects milk composition. The aim of this thesis was to evaluate the incidence of ketosis in a selected dairy cow herd. The incidence of ketosis was evaluated in lactating Holstein cows over a period of three years (2020-2022) in the dairy farm in Žákava. Ketosis was detected on the basis of beta-hydroxybutyrate (BHB) content in the blood of the cows using the FreeStyle Optium NEO device. A BHB value of 1.0 mmol/l or higher was considered as an individual affected by ketosis. A total of 1740 dairy cows were included in the study. Ketosis ocurred at a relatively stable level of 20 %. There were fluctuations in the frequency of ketosis across seasons, as well as fluctuations in the average blood BHB content. The effect of the treatment procedure and the effect of prevention on the incidence of ketosis were also investigated. The treatment success rate was 80.41 % for the study period. Treatment with monopropylene glycol and prodigestane was largely successful. Intravenous glucose administration had a slightly lower success rate. Preventive measures had a positive effect on both the frequency of ketosis and the average blood BHB content. In addition, the presence of ketones bodies in milk, the relation of ketone bodies in blood to ketone bodies in milk and the effect of elevated blood BHB on milk composition were determined according to performance monitoring protocols. Both acetone and BHB contents were increased in milk from sick cows. The levels of ketone bodies in milk are positively correlated with the level of BHB in blood. Increased blood BHB content results in a change of content of individual milk components. The highest difference was found in the fat content, an increase of 4,89 %. Further, the citric acid content increased with the BHB content of the blood and the protein, lactose, non-fat dry matter and urea content decrease.
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The evaluation of milk quality parameters in selected farm
JANŮ, Vladimír
The aim of this study was to evaluate milk production and quality of raw cow milk on a selected farm. Pool and individual milk samples were evaluated. The analysis of pool milk samples was done based on the data provided from the selected farm. Data on quality parameters for individual milk samples were obtained from laboratory examination of the collected samples. From the pool samples, the effect of year and calendar month was found to be statistically significant for the values of somatic cell count, total number of microorganisms, freezing point, fat content, protein content, non-fat dry matter and lactose and pH of milk. In the individual milk samples, the protein content and citric acid content of the milk were found to be higher than the normal milk content. Of the fatty acid content of milk fat, the highest saturated fatty acid content was found.
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Some factors affecting milk somatic cell count
ŠPIKLOVÁ, Hana
The aim of this thesis was to compare somatic cells count (SCC) in milk depending on certain factors (month, milk system, lactation). Besides of SCC, also other parameters of milk quality were monitored. Milk sampling took place for 11 weeks in 2017 and samples were taken from 15 milked cows of the Czech Simmental breed. During the milk sampling were used two different parameters of pulsation. Pulsation adjustment significantly shortened the time of milking from 7,34 minutes in average to 6,19 minutes in average (P<0,001). After pulsation adjustment the SCC decreased from 188,000/ml to 154,000/ml as well, however, differences were not statistically significant. Concerning other factors the SCC was mostly affected by the number of lactation (P<0.01), primiparous cows had significantly lower values of the SCC (45,000/ml) that multiparous cows (237,000/ml).
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Milk and plant based milk from a nutritionist's point of view
Šalovská, Martina ; Mottlová, Alena (advisor) ; Dostálová, Jana (referee)
This diploma thesis focuses on differences between animal milk and its plant-based alternatives. This work is divided into a practical and theoretical part. The theoretical part describes composition of the plant-based milk, its consumption and its quality compared with the animal milks. One section from the theoretical part deals with the most frequent myths about animal milk. The practical part is devoted to a research. The main aim of this research was to find out (by using a questionnaire), whether and how often students consume animal milk and its plant-based alternatives, which of these they prefer, what the reason for the consumption is and what the sources of the information on animal milk and its plant-based alternatives are. Other aims of this research are to evaluate the knowledge of the questioned students about this issue and to find out how the students perceive this problem and to prove or disprove the stated hypotheses. The purpose of this diploma thesis is to help clients to orient themselves in the information on animal milk and its plant-based alternatives and to clarify some of the myths which still occur in the population. Key words: milk plant milk the effect of milk on health milk composition
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Clotting of cow and goat milk
PECOVÁ, Lenka
The thesis deals with two technological properties determining the quality of milk, clotting and fermentation ability by titrable acidity, which are influenced by a large number of factors. The aim of the work was to assess the influence of milk composition, breed, order and stages of lactation on clotting and souring ability of cow and goat milk based on obtained analysis. Detailed analysis focused primarily on cow milk.
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Fatty acid composition of caprine milk and milk products
PECOVÁ, Lenka
Changes occur in milk during the technological processing of raw milk, which also affect the properties of milk fat. Dairy products may have different properties compared to the raw milk. Chemical and microbial processes can alter the presence and distribution of individual fatty acids and thus influence the nutritional value of the product. The aim of this thesis was to assess the presence of fatty acids in milk fat of goat milk and to evaluate differences in the spectrum of fatty acids in goat milk and yoghurt produced from it.
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The proportion of fatty acids in goat milk fat.
SAMOHEJLOVÁ, Kamila
The thesis deals with the assessment of proportion of fatty acids in milk fat on goat farm and watching the selected proportion of major fatty acids in the selected factors. Sampling took place between 2010 and 2011, were made three taking of milk in a different stage of lactation. Evaluation of fatty acids was carried out both within groups and for major acid alone. The thesis was also included evaluation of quality indicators and yield of goat milk.
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