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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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Hygienická kvalita mléka
Holá, Kateřina
This work deals with the hygienic quality of milk, the possibilities of its influence in the barn in the process of breeding and in its acquisition. The theoretical part describes in detail the various components of milk, such as proteins, fats, carbohydrates and focuses on hy-giene of the milk before and after milking. There is also described heat treatment of milk, including cattle diseases that affect milk production. In the practical part evaluates the qual-ity of the milk sold in selected farm. Starting from the results of laboratory analyzes of milk, which are assessed according to the season and the state of health of dairy cows.
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Vliv změny kondice dojnic českého strakatého plemene skotu na jejich mléčnou užitkovost
Maňoušková, Iveta
This diploma thesis was made to evaluate the influence of body condition change in Czech Fleckvieh cattle to their milk production in one-year monitoring of 214 dairy cows. Their body condition was individually valued with 5-point system named Body Condition Scoring (BCS) with accuracy to 0,5 point. Body condition of these dairy cows was written down between 1 up to 2 months before calving and then between 40 up to 70 days after calving. The change in body condition between these two terms was subsequently evaluated to milk yield and the composition of milk. There was also evaluated the influence of body condition change to phase of lactation, parity and somatic cell count. Relationship between body condition change and milk yield was highly positive. Relationship between body condition change and the amount of milk fat, milk protein, fat to protein ratio, phase of lactation and somatic cell count was not proved.
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Produkce a složení kozího mléka
Baďurová, Tamara
In my bachelor thesis, firstly I focused on the importance of goat breeding and reasons why we breed goats. In a few sentences I processed what diferences are between cow milk and goat milk in their quality and composition. The biggest part of my bachelor thesis include factors which influence quality of milk. Quality of milk is related to compositions of milk and milk yield. I focused especially on factors which influence content of fat, protein, lactose, mineral substances, vitamins, microorganisms, somatic cell and residues of the inhibitory substances. In the second part I focused on factors which influence milk yield of goats. Among these factors belongs lactation stage, order of lactation, time and rightness of milking, frequency of milking, pregnancy stage, number of born babies, weather, stress factors, udder size, body framework, live weight, nutrition, breeding method, hormones, breed, individuality, lokomotion, rut cycle, age and health condition. In conclusion in a few sentences I devised how and when take the control sample of goat milk, how to determine the milk yield and laboratory let to determine selected compositions of milk such as fat, protein, lactose, somatic cell and microorganisms.
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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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Vliv bílkovinných koncentrátů na složení mléka u dojnic v ekologickém chovu
Botková, Kateřina
The aim of the thesis was to investigate the effect of the protein concentrate on milk quality. The attempt took place on an organic dairy farm with cows of Holstein breed, which was added to the ration a concentrate containing 60 % soybean cake, 20 % sunflower cake and 20 % linseed cake at 1 kg / head / day. The experiment lasted 30 days. Content of fat, protein, lactose, urea, free fatty acids, somatic cell count and the concentration of citric acid was determined in milk samples. Milk production was evaluated from the quantitative parameters. Addition of the concentrate had a positive effect on the fat content (P <0.05) and a decrease in free fatty acids (P <0.05). Production of urea which may be in excessive concentration dangerous for the health of dairy cows, was increased (P <0.05). Concentrate did not affect milk yield, protein content, lactose and somatic cell count. The content of citric acid was increased in the experimental and control groups (P <0.05). The results showed that the addition of protein concentrate can affect certain components of milk, but in case of inappropriate inclusion in the mix, there are health risks associated with excessive excretion of urea.
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