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No description available.

No description available.

No description available.

No description available.

The work deals with the winter maintenance of roads in Prague 6, in the establishment Drnovská, the company of Pražské služby a.s. .. It describes the optimization of road maintenance district. It includes equipment, deicing materials needed for winter maintenance and operation of the entire facility, including the work of employees. There is an analysis of the status quo on the establishment of shortcomings and ways of eliminating them.

The aim of the study was to investigate the effect of high temperature on selected parameters of semen quality of duroc boars at the insemination station in Velké Mezirici (N 49°23.46667', E 15°52.70135') in season from May to September. For purpose of the experiment were chosen 20 boars of the Duroc breed, divided into two groups. Group A (the control group; n = 10) has average quality of semen and group B (the experimantal group; n = 10) showed below-average long-term quality of semen. Analysed parametres were volume of ejaculate (ml), concentration of sperm (thousands/ml), total account of sperm in ejaculate (mld. ks), motility (%) and rate of abnormal sperm (%). In the stable the temperature (°C) and relative humidity (%) were monitored at hourly intervals for whole period of this study. The results of the experiment shows that the volume of ejaculate from both monitored groups increased at the same rate (P > 0.05) and in group A from 198 ml to 252 ml; in group B from 203 ml to 241 ml. Concentration of sperm of group A decreased (from 499 000/ml to 436 000/ml), whereas concentration of sperm of group B was at the same level during the experiment. The motility of sperm of group A at the end of the experiment increased (from 71.4 % to 74.0 %) and motility of sperm of group B has intensively decreased (from 67.3 % to 62.2 %). The decreation of sperm motility was statisticaly significant (P < 0.05). The influence of ambient temperature in this case had no significant effect on boar semen with average values (group A), but has been reported statistical significance in deterioration of sperm motility (P <0.05) and number of morphologically abnormal sperm (P < 0.05) in group of boars, who showed below-average long-term semen quality (group B). In both groups there was lower sperm concentration, which could be due to the increased volume of ejaculate in the summer months.

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No description available.

The aim of this thesis was to inventory the natural regeneration of pedunculate oak on floodplain sites (FE Židlochovice, forest district Židlochovice), analysis of the conditions where the regeneration of oak under mother canopy shows a determination of potential natural regeneration of oak on the FE Židlochovice. It had been inventoried 8 (7.96 hectares) stands. These forests occupy approximately 0.24 % of the total area of interest (3355 ha). From this number fulfills the criteria ensuring the 5 forest stands (6.02 ha). The determining factor for regeneration under canopy of pedunculate oak is gap fraction (GFr) and the limiting factors are the state of the soil cover and damages by game. Natural oak regeneration can be achieved only at large-scale regeneration cuttings, but also in smaller areas such as border cutting and successfully grow it to established state.