Selenium status was assessed directly by determination of selenium concentration, or indirectly by measurement of glutathione peroxidase activity in whole blood samples collected from 879 cattle (733 cows, 63 calves, 42 heifers, 41 finishing bulls) reared on 93 farms in 12 of the 14 regions of the Czech Republic. Selenium deficiency or marginal values were found in 50 % of the tested animals and on 54 % of the farms. In terms of animal categories, deficient or marginal selenium status was found in 42 % of cows, 80 % of calves, 100 % of heifers, and 90 % of bulls. Seleniumdeficient herds were detected in almost all regions of the Czech Republic. The lowest selenium concentrations (< 20 µg . l -1 whole blood) were found in western, northern, and north-eastern Bohemia and in northern Moravia. It is evident that selenium deficiency in cattle is a topical problem in the Czech Republic and that selenium status must be monitored within preventive diagnostics in all age groups of cattle to decide correctly on the most effective way of supplementation.

Selected indicators for the metabolic profile of blood plasma in 22 Aberdeen Angus bulls reared by the extensive method were monitored during postnatal development (from 4 to 564 days of age), including total proteins, albumin, urea, creatinine, glucose, cholesterol, triacylglycerols, bilirubin, alkaline phosphatase, alanine transaminase, aspartate transaminase, tyroxin, triiodothyronine, calcium, inorganic phosphorus, magnesium, potassium, sodium, chlorides, copper, zinc and iron. In assessing the relationship of age to the indicators of the internal environment, values of correlation coefficients for total proteins (r = -0.70; p < 0.01), albumin (r = -0.56; p < 0.01), urea (r = -0.73; p < 0.01), glucose (r = -0.38; p < 0.01) and triiodothyronine (r = -0.82; p < 0.01) were established. Significant relationships were shown between the temperature of the external environment and the amount of total proteins (r = -0.38; p < 0.01), urea concentration (r = -0.41; p < 0.01), ALP (r = 0.58; p < 0.01) and ALT (r = 0.45; p < 0.01) activity. Temperature also showed a significant impact on the concentration of P (r = 0.57; p < 0.01), K (r = -0.69; p < 0.01) and Zn (r = 0.33; p < 0.01). The work yields important information on changes in the indicators of the metabolic profile of the blood plasma of bulls during postnatal development under defined nutritional and temperature conditions that can be used as reference values for evaluating health status as well as nutrition level. Beef cattle, internal environment, blood plasma nutrition status

At present, corporate governance has changed considerably. The company may have far more environmental and competitive influences of great intensity than it was in the past. In order to thrive and stabilize the competitive struggle, the company has to adapt, acquire and respond flexibly to consumers and capture the value of product and service delivery as effectively as possible. This can be achieved by a well-set business model that has to be constantly upgraded in relation to current trends, demand and other factors. The purpose of this paper is to discuss the current trend of open business models and of open innovation in relation to business models. To achieve this goal, a search using keywords in Web of Science database and a subsequent bibliometric mapping study with VOSviewer software is used. In final, the systematic review following the PRISMA guideline is included. Out of the 180 results, 28 papers were found suitable for qualitative synthesis. The results of the articles confirm the positive effect of open business models and open innovation based business models to value creation, effectivity and business performance. The growing trend of co-creation and collaboration in the field of business models is confirmed as well. Open business models and models based on open innovation are becoming more and more discussed over time. They are particularly useful in sectors characterized by high investment costs.

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Nowadays, almost everyone uses banking services. However, there is room in the market for bad decision-making by clients in the RCBS market, which is caused by information asymmetries. The main goal of this paper is to simulate consumer behavior and compare the offer in the banking services market in the Czech Republic. A total of 9 different payment accounts were selected for the research, which are intended for non-business natural persons. Furthermore, two customer groups were defined, for which the fees for the mentioned payment accounts were subsequently calculated on the basis the intensities of the use of certain services. In general, it was found that the stochastic calculation is more different than the deterministic one, especially for accounts and services that contain a certain condition, and the intensity of use is close to the transitional limit of this condition. On the contrary, in the case of bank calculators, the differences compared to the calculation from the tariffs were too large, and there was also a considerable mixing of the order according to the price.