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Analýza faktorů ovlivňujících reprodukční vlastnosti nandu pampového
Muchová, Tereza
Focus of this diploma thesis is the analysis of partial influences having impact on the reproduction of Greater rhea. It captures a detailed description of the most common factors, such as housing, nourishment, season’s effect, climatic conditions, genetics and subsequent breeding of chickens. Included is an anatomical description of reproductive organs of both sexes and getting the reader acquainted with the social behavior of this animal. Thesis also consists of ethological observations of defined individuals with focus on the influence of the season on various daily activities. Finally, an analysis of the eggs is performed that includes the overall laying capabilities of the female, along with hatchability, fertilization and mortality of embryos. As an appendix of the diploma thesis you can find recommended precautions increasing the possibility to improve the level of reproduction for the breeders.
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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.
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Qualitative indicators of eggs from different types of feeding
HUBKOVÁ, Michaela
This bachelor thesis dealt with the influence of rearing forms on selected qualitative characteristics of hen eggs. The observed egg samples were from litter, free-range, organic and home rearing. The parameters evaluated were - shell breakage and cleanliness, height, stability and position of air bubble, white transparency and firmness, yolk post-movement and position, embryo visibility, weight, evidence of cleaning, incidence of flesh spots, yolk and firm white index, Haugh units and shell thickness. The values found were not significantly different and were close to the average values.
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Reologické vlastnosti žloutků slepičích vajec v průběhu skladování
Pavková, Lucie
The thesis deals with the influence of storage time on particular physical and rheolo-gical properties of a yolk of chicken eggs. Monitored eggs were stored at 6 °C for 8 weeks. The thesis describes the influence of storage time on physical characteristics of a whole egg, such as weight and shape index. As expected, the weight loss of chicken eggs was demonstrated during eight weeks storing. Egg yolk (colour, height, width, weight, index and density) was also described and evaluated in detail. According to our estimates, there are no significant changes in weight during yolk storing. But yolk index is distinctly decreased. During the final part of monitoring rheological properties were evaluated - apparent viscosity, time dependence of viscosity and dependence of shear stress on the shear rate (flow curves). The experiments have proved Newtonian behaviour of egg yolk throughout the storage. The storage time has also clear impact on flow properties of yolk. The results of each experiment were modelled using the power law (Ostwald-de Waele) model.
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Vývoj spotřebitelských preferencí na trhu vajec v ČR
Němcová, Monika
The Bachelor Thesis deals with what are the consumer preferences on the eggs market. By way of introduction discusses the agricultural fair, specifics of demand and also selected commodity, which means eggs. Eggs are very important food in the nutrition and so are parts of a diet of most people. The aim of this thesis is to find out what information is of interest to consumers when buying eggs. These information is get through questionnaire survey and is focused on basic characteristics, such a price, colour of shell, or whether information mentioned on wraps are sufficient for the consumer sufficient, or what extra information would be welcomed.
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Změny mikrobiální kontaminace vajec v průběhu skladování
Zemanová, Aneta
This masters thesis deals of microbial contamination of chicken eggs in storage. Test samples were tracked for the following microbial indicators: Total Viable Count (TVC), bacteria of the Enterobacteriaceae family, bacteria of the Enterococcus genus, psychrotrophic microorganisms, yeasts and molds. Microbial analysis was made for eggs acquired from market chains, originating from three different farming environments: enriched cages, cage-free and free range. Samples were stored in three different temperature environments: refrigerated at 5 °C for the whole storage period, stored in a thermostated box at 28 °C for the whole storage period and alternating between 5 °C and 28 °C temperature environments with one week storage periods each. The analysis of acquired test samples shows that TVC did not change significantly between different farming environments and storage temperature environments. Cage-free eggs show increasing TVC in long time storage (21 days). Cage-free and free range eggs also show higher count for Enterobacteriaceae. Enterobacteriaceae counts show significant differences between samples stored at constant 28 °C and alternating temperatures. Lowest microorganism count for bacteria of the Enterobacteriaceae family was observed at alternating temperatures. Long time storage resulted in elevated Enterobacteriaceae count in cage-free eggs. Presence of Enterococcus, psychotrophic microorganism and molds was detected in a low number of samples.
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Comparison of qualitative indicators of hen's eggs from different types of feeding
ŠTĚPÁN, Stanislav
The presented bachelor thesis dealt with the comparison of qualitative indicators of hen's eggs from different types of breeding. Samples from cage farming production system, indoor housing systém and free-range home breeding were used for comparison. Ten eggs from each type were used. The following qualitative indicators were evaluated and compared - egg weight, shell integrity, air cell height, shape indices (shape index and egg index), occurrence of blood and meat spots, solid egg white and yolk index, egg quality expressed in Haugh units and shell thickness. The eggs from the individual types of breeding were similar in shape, but diffe-red the most in size and weight, the weight was measured from 49 to 91 g. Two samples had a damaged shell. The height of the air cell ranged from 2 to 4 mm. The values of the solid protein index ranged from 0.061 to 0.156 and the yolk index ranged from 0.39 to 0.51. Haugh units ranged from 74 to 107. The shell thickness was between 0.37 and 0.47 mm. All results were in or near the average.
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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.
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