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The aim of our study was to describe the morphological changes in the boar testes affected with hypozincaemia that was induced by zinc-deficient feed (barley meal). Our experiment was carried out on eight (n=8) 8-month old boars of Slovak large white breed. For 100 days the animals were fed only barley meal and had free access to drinking water. Before inclusion in the experiment, all animals were examined for serum zinc level by the method of atomic absorption spectrophotometry. Zinc serum levels in boars determined before the experiment reached 20.10±1.72 μM. After 100 days of feeding barley meal the zinc level was 8.97±1.65 μM which indicated hypozincaemia. By day 20 after parenteral application of Zindep inj. (Biotika, SR), the level of zinc increased to 22.13±1.45 μM and by 60d it showed again a slight decrease to 18.46±1.056 μM. The concentration of zinc in the barley meal was 30.14 mg/kg. Deficiency of zinc caused degeneration and depletion of the seminiferous epithelium and morphological changes in Sertoli cells. Seminiferous tubules were damaged to a variable degree. Morphological changes were observed also in Leydig cells and the number of malformed spermatids was increased. Zinc deficiency was accompanied with anorexia, growth disorders, and parakeratosis. A single parenteral application of the preparation Zindep® inj. at a dose of 0.2 mgZn/kg body weight resulted in a partial restoration of spermatogenesis within 20 days and complete recovery within 60 days following treatment

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Several studies have reported that the construction of the Grand Ethiopian Renaissance Dam (GERD) could have severe effects on the water resources in downstream countries, especially Egypt. These effects include changes in surface water level, groundwater levels in shallow and deep aquifers, saltwater intrusion, and increases in soil salinity, which could affect crop yields. This paper assesses the potential impacts of the GERD on the Nile Delta, Egypt. It includes the effects of reducing surface water levels (SWL) and changing the crop patterns at the groundwater levels (GWL), in addition to the effect of cultivating crops that consume less water on soil salinity. A pilot area is selected in the east of the Nile Delta for the assessment. The results of the study revealed that GWL is directly proportional to SWL. Comparing the case study of 2012, when SWL was reduced by 50%, the GWL decreased from 5.0 m to 2.0 m. After adjustment, the crop patterns from rice to other crops decreased the GWL to 1.30 m. Additionally, the results showed that there is a significant relationship between soil salinity and crop patterns. Soil salinity increased during the cultivation of the Delta with non-rice crops, such as grapes. Salinity increased from 0.45 S/m after 10 years of simulation to 0.48 S/m. This estimation highlights the undesirable effects of the GERD on Egypt’s water resources, soil salinity, crop yields, and national income.

The issue of sustainability has long been the subject of interest of the architecture engineering and construction sector. All three aspects of sustainability - economic, environmental and social - can be affected through appropriate construction waste management. Construction and demolition waste (CDW) is one of the largest worldwide waste streams, therefore it is given great attention by all stakeholders (investors, contractors, authorities, etc.). Researches have shown that one of the main barriers to insufficiency CDW recovery is inadequate policies and legal frameworks to manage CDW. It is also one of the EU's environmental priorities. Aim of the article is to confirm the economic potential of construction and demolition waste audit processing through case study. A pre-demolition waste audit has been processed for unused building of shopping center in the town Snina in Slovakia. Subsequently, a comparison of economic parameters (waste disposal costs and transport costs) of recommended CDW management was performed. This comparison confirmed the economic benefits of environmentally friendly construction waste management methods according to the waste audit results, which will also increase the sustainability of construction projects. In addition, the cost parameters of selected waste disposal methods could be another dimension of building information modelling.