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Analysis of selected milk quality indicators and their impact on the yield and sensory properties of fresh cheeses
PLONER, Michaela
The aim of the diploma thesis was to evaluate the effect of cow´s milk quality on the fermentation, yield and selected properties of fresh cheese produced in laboratory conditions. For this purpose, there were 51 fresh cheese samples produced in three trials from 17 bulk milk samples originating from six farms. For milk and cheese sam-ples, selected analyzes were performed, and the obtained data were statistically eval-uated. The chemical composition, physicochemical and sensory properties, weight and yield of fresh cheese were evaluated depending on i) the time of fermentation, ii) the milk quality. As expected, the average values of pH, weight and yield of the fresh cheeses differed during the fermentation. The protein content, lactose and so-matic cell counts significantly influenced the yield and quality indicators of fresh cheese. The quality of milk also influenced the assessment of sensory properties, es-pecially color intensity and consistency. To achieve the optimal pH of fresh cheese (<5.00), the time of fermentation should be from 15 to 16 hours.
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Influence of different factors for qualitative parameters of ensilage feedstuffs
KUBÁT, Václav
In the operating conditions, for the period of three years, were estimated the qualitative factors affecting the qualitative parameters of grass silages. The fermentation characteristics and the total quality of silages were evaluated by the recommendations of AgroKonzulta Žamberk and EKO-LAB Žamberk companies. The feed samples (silages) were evaluated in two sets of databases. First set of samples assessed the impact of additive substances on the basis of parameters of fermentation characteristics. This first set of samples was divided into three groups; each of them had 14 samples. First group of the samples was untreated; no preservations were used on these samples. Into the second group of the samples were included the silages treated with bacterial preparations. The third group contained the silage samples treated with bacterial-enzyme preparations. It is possible to conclude that the silage{\crq}s additives positively affect the fermentation process and thus the final silage quality. High statistical significance (P < 0.01) was found for level of proteolysis. Better values were achieved in groups with the use of preservations. Group of grass silages using preservations achieved significantly better values (P < 0.05) in lactic acid content than the group with none using of the preservations. Grass silage samples treated with the bacterial-enzymatic preparations had about 14.4 % more representations in I. class quality than the group treated with bacterial preparation. The second set of samples was classified by the phenophases: before the heading, the beginning of heading and full heading. Each group contained 12 samples. The parameters of nutritional value were evaluated. The chemical compositions (NL, PDIN and SOH) were highly significantly affected (P < 0.01) by the phenophases. The best results have been reported in grass silage harvested in the phenophase before the heading. The chemical compositions CF and NEL were better (P < 0.01) in grass silages harvested in the phenophase before the heading and in the phenophase the beginning of heading against grass silage harvested in the phenophase full heading.
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Selected Qualitative Parameters of Honey Bee Colonies Acquired During the Calendar Year.
JEŘÁBEK, Miloš
Topic of bachelor thesis is "Selected qualitative indicators of honey from different bee hives that were obtained during a calendar year." Main aim of the thesis was to conduct a research of topic given and to compare selected indicators (water content, acidity, electrical conductivity of honey, proof of honey samples being disrupted by starch sirup, starch sugar or malt extracts and other qualitative indicators of honey) from samples of honey that has been collected during a defined period of the year (May, June, July). In the experimental part of the thesis, analysis was performed using defined indicators of quality from selected samples of honey of those that were collected from bees of our own bee hives. European norm for water content in honey was satisfied in 59 samples out of 60. Norm for Czech honey was satisfied in May and June in 9 samples and in July in all 20 samples. Norm for honey acidity and disruption by starch sirup, starch sugar or malt extracts satisfied all 60 samples.
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Study of selected factors influencing maize for silage agronomic attributes
KADOUN, Lukáš
In the years of 2009 and 2010, an observation of chosen quantitative and qualitative measures of several hybrids of corn took place at PS Humpolec and ZD Hosín. Quantitative measures were evaluated based on dissection of individual plants, qualitative measures then through common laboratory methods. In the field experiments at PS Humpolec, an observation of the seeding quantity and nitrogen load took place. The seeding quantity influenced with very high size of effect all agronomical and seed figures, except for the number of rows in the cob, where only high size of effect was observed. The quantity of 85 thousand seeds per hectare seems to be optimal. The nitrogen load influenced with very high size of effect the weight of the cob, with high size of effect the number of cobs and the weight of grains in the cob. Other measures were not affected. The year influenced with very high size of effect the length of the plant, the number of leaves, the weight of the cob; with high size of effect the height of the first cob on the plant and with considerable size of effect the number of cobs on the plant and the length of the cobs. Other observed measures were not affected by the year. Optimal nitrogen load that can be recommended is 110 kilograms per hectare. The best digestibility was noted with 100 thousand seeds per hectare and 110 Kg of nitrogen per hectare, or with 70 thousand seeds per hectare with no nitrogen. In the operational and half-operational experiments at ZD Hosín, differences between chosen hybrids were observed. Based on the results, the best one that can be recommended for these environmental conditions is Karacho, with FAO 260. Hybrid Karacho achieved the highest yield of matter in both years and in the year of 2010 it also achieved the best digestibility.
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