National Repository of Grey Literature 18 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
Návrh a vyhodnocení podnikatelské strategie pro produkci slepičích vajec
HAUSER, Jan
The goal of the work was to find a demonstrable effect on cost savings for the monitored technologies and to compare the quality of eggs from individual types of breeding. The partial goal of the thesis was to find a suitable technology for the chosen business plan, present it and evaluate it financially. In order to prove the effect on cost savings, three companies were approached and provided information about their breeding hens. From the obtained information, the occupancy of the halls, the average number of eggs laid per hen, the number of hens per employee and the consumption of feed mixture were determined. The evaluation of egg quality was based on twelve samples commonly available in stores. Among the samples were eggs from cage, indoor, free-range and organic farming. Price and weight, ratio of major components, shape index, yolk index, albumen index, Haugh units and yolk color were evaluated. In the last part, four manufacturers of mobile chicken coops with a capacity of 50 to 1,040 hens were presented. A SWOT analysis, Porter's five forces model and a comparison of costs and benefits were carried out. At the end there is an evaluation for practice. The results of the impact on cost savings did not point directly to a specific technology. It was found that the occupancy of the hall and the intensity of human labor have a direct effect on cost savings. It was also found that as the number of hens raised increases, the cost per hen decreases. The evaluation of egg quality also did not point directly to one technology. Eggs are better or worse in various tests. However, a lower quality of eggs produced in organic farming can be observed here, which is influenced by the time of the test. The financial analysis of the future business plan showed its feasibility. She also pointed out several recommendations that should be considered before the actual implementation of the project.
The quality of eggs - general, functional and nutritional properties
PECH, Miloslav
This bachelor's thesis, processed in the form of a literary review, focuses on a comprehensive view of hen's eggs, analyzing their general, functional, and nutritional properties. After the introduction, a literary review follows, mapping the biological origin and domestication of the chicken, and then summarizing the current state of chicken farming. The thesis then delves into the formation and development of eggs, examining the structure and chemical composition of the yolk and albumen, including their proteins, lipids, carbohydrates, pigments, vitamins, and minerals. The physicochemical properties of eggs are also analyzed, including a total of seven properties such as specific gravity, freezing point, or refractive index. A detailed examination of the functional properties of eggs follows, which represent a key element in understanding their wide use in the food and culinary industries. The thesis focuses on analyzing the mechanisms through which hen's eggs can form gels, foams, and emulsions, which are properties that play an important role in various food processes and recipes. These properties are essential for the production of various foods, such as gelatin desserts, leavened doughs in baking, sauces, and mayonnaises. Eggs are also recognized as functional food because they are a rich source of nutrients, including vitamins, minerals, and biologically active substances that can contribute to overall health. These substances can, for example, help reduce the risk of heart disease and improve eye health. In the next section, the thesis focuses on the nutritional properties of eggs, examining microbial contamination, egg allergies, and biologically active substances such as choline, immunoglobulin Y (IgY), and lutein and their impact on human health. An overview of this section provides a deeper understanding of hen's eggs and their influence on human nutrition and health.
Development of quality indicators of hens eggs from different types of breeding over time
ŠTĚPÁN, Stanislav
This thesis dealt with the determination of quality indicators of hen eggs from diffe-rent types of breeding - free range (domestic), litter house and enriched cage bree-ding, their comparison with each other and with our own results from 2021. 10 samples from each breeding were evaluated. There was no significant difference (p>0.05) between the eggs from each type of rearing in terms of volume, shape index, air bubble height, solid white index, Haugh units and yolk index. The shell was intact in all samples. There were differences in egg weight (p<0.001) and shell thickness (p<0.05). When compared with the 2021 results, the largest differences were in the litter-reared eggs, which were different in all parameters except shape index. For free-range (home-reared) eggs, there were differences in weight, shell thickness (p<0.001) and egg shape index (p<0.05). Eggs from enriched cage rearing differed in weight (p<0.001) and yolk index (p<0.01).
Zařazení barevné pšenice "AF ZORA" s vysokým obsahem antokyanů na parametry užitkovosti nosnic na konci snáškového cyklu
Schořová, Michaela
The hypothesis of the experiment was to determine the effect of anthocyanins from the black AF Zora wheat variety on the reproductive parameters of weaned hens (>72 weeks of age). 120 laying hens of the breed Rhode Island White were used for the experiment and were divided into two groups - control and experimental in six repetitions. The experimental group was fed with a feed mixture containing 60% AF Zora black wheat and the control group 60% ordinary wheat of the Vanessa red variety. The experiment lasted 18 weeks, dur-ing which feed consumption, egg laying, egg quality, bone strength, antioxidant activity and phytoestrogen activity were monitored. The positive effect of anthocyanins was evident on egg-laying (P<0.05) in the experimental group, but at the same time, the weight of one egg in this group was about 1 g less and the quality of the shell deteriorated. Furthermore, the eggs of the experimental group had higher haugh units (P<0.01). The effect of anthocyanins on the antioxidant activity determined using the FRAP method was not confirmed. Phytoes-trogenic activity determined by mRNA expression of vitellogenin (VTG 1 and VTG 2) was not confirmed.
Vitamin D blood level and its relationship to recurrent childhood diseases
HAVLOVÁ, Adéla
"Vitamin D blood level, factors that affect it, and its relationship to reccurent infections" is topic repeatedly discussed in domestic and foreign literature. This topic is a multidisciplinary issue, but it mainly relates to nutrition and sun exposure. The aim of this study is to map relationship of vitamin blood levels in relation to diseases of the respiratory system, vitamin D suplementation, recurrent infections, usage of sunscreen with a protective factor, nutrition and outdoor stay in winter months. The study was conducted on a research sample of preschool children. Two sets of data were used to evaluate objectives and research questions. The first research group consisted of 48 children and had 2 groups. The first group of 21 children was established in the Waldorf kindergarten in Rudolfov and the second group of 17 children was created in a non-state medical facility in Trebon. The first research consisted of 48 children who were tested on vitamin D blood level and filled survey questionnaire. The second research consisted of 61 children who were tested on vitamin D blood level in a non-state medical facility. Some results of this study are contradictory because of inadequate methodology. Positive results have been shown with vitamin D supplementation, higher consumption of liver, eggs and daily intake of vegetable oils.
Eggs as a Suitable Tool for Species Diagnosis of Causative Agents of Human Diphyllobothriosis (Cestoda)
LEŠTINOVÁ, Kateřina
More than 2,000 eggs of 8 species of diphyllobothriid cestodes infecting humans were compared. Combination of morphometrical and ultrastructural (surface morphology) data made it possible to distinguish all species.
Differentiation of different types of eggs by mass spectrometry
Švárová, Markéta ; Kučková, Štěpánka (advisor) ; Rusek, Martin (referee)
The aim of the diploma thesis was to distinguish bird species based on the expected different protein composition of eggs and their individual components using mass spectrometry. The obtained results could be possibly used to identify the animal origin of egg materials used in works of art. For the research, components of the eggs (yolk, egg white and their mixture) of nine available bird species were collected and dried - pheasant (Phasianus colchicus), domestic goose (Anser anser domesticus), domestic duck (Anas platyrhynchos domesticus), muscovy duck (Cairina moschata), chicken (Gallus gallus f. domestica) - four different specimens, Japanese quail (Coturnix japonica), pampas rhea (Rhea americana), red ore (Alectoris rufa), speckled guinea fowl (Numida meleagris). The samples were digested by the enzyme trypsin and prepared using ZIP-TIP for the next measurements by MALDI-TOF (Matrix-Assisted Laser Desorption / Ionization - Time of Flight) mass spectrometry. The obtained data were evaluated by Principal Component Analysis (PCA). The used method showed that the most bird species can be distinguished by yolks (with an approximately 95% success rate) and more than half of the species by egg white proteins (success rate 83%) and by the egg white and yolk mixtures (success rate 80%). Two samples of...

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