ASSESSMENT OF THE ECONOMIC TIME OPTIMUM FOR THE USE OF BROOD SOWS

Economic indicators in the pig production depend greatly on the results in the piglet production. One of the factors which have impact on the piglet production expenses is the period of the use of brood sows. Determining the optimal period of the sow usage is made through the assessment of the optimal number of the achieved farrows. In this paper, calculations of the prices have been made for produced piglets relative to the moment of exclusion from the reproduction process. Calculations show that the optimal period of the use of a sow, from the aspect of the minimal price 6 to 8 parities, while the price of a piglet increases afterwards. The advantage achieved by the high percentage of separation should not be neglected: faster introduction of new lines of gilts and less energy for meeting basic needs. On the other hand, apart from the decrease in the costs, low percentage of separation results in the low percentage of second-farrows, more fatlings per sow, lower percentage of gilts in the progeny, more space required for sows in reproduction stage and less difficulties during the gestation period

ECONOMIC CHARACTERISTICS OF CONCRETE PRODUCTION FROM FLY ASH AS A WAY OF LAND RECULTIVATION

Application of fly ash in the construction industry is particularly significant in the terms of environmental protection and in the terms of improvement opportunities of certain properties of cement mortar and concrete. In addition to this, it is possible to perform the recultivation of significant area of agricultural land. Concrete production precedes the production of lightweight aggregate which is then used as an aggregate. Calculated costs of concrete production using lightweight aggregate were 70.52 €/m3. Most of these costs are energy costs in the sum of 85% of total costs. In the situation when the costs of concrete production using lightweight aggregate are compared to the concrete price at the market, or produced with the use of construction gravel, estimation of the economic viability gives a negative result. This result is caused by the high cost of the aggregate. The observed calculation did not include an improved thermal-insulating property of concrete and reduce pollution through binding of waste ash. According to this, final assessment can only be made after extensive technological, macroeconomic and environmental analysis. Economic analysis should be primarily based on the value of land that can be recultivation in this way

Potential of Agricultural Biomass: Comparative Review of Selected EU Regions and Region of Vojvodina

Owing to the fact that the EU is committed to reducing greenhouse gas emissions by 20% below 1990 levels by 2020, and having in mind their high dependence on import of oil and oil derivatives, which, in turn, causes instability of power supply, increasing attention is being paid to renewable energy sources. Given the ongoing pre-accession process of the Republic of Serbia in relation to the EU, in order to determine the capacity of the country to increase the share of energy use from renewable sources, in this paper clustering of selected regions in the EU-28 has been carried out, after which a comparative analysis of regions was performed in terms of potential of agricultural biomass, for the purpose of generating energy. The aim of this study is to determine the level of the region of Vojvodina in relation to ten selected EU regions, based on parameters that affect the potential for using renewable energy sources, primarily residues from agriculture. By applying the K-means method, Borda count method and comparative analysis, and based on empirical data, results show that the region of Vojvodina takes a significant fifth place. Its share of agricultural land ranks it as the first, whereas production of cereals and the total number of farms larger than 100 ha rank it as the second. It could be concluded that Vojvodina is an agricultural region with large quantities of plant remains, primarily those left over from harvest, which represents a significant potential for energy generation from agricultural biomass

ASSESSMENT OF THE ECONOMIC TIME OPTIMUM FOR THE USE OF BROOD SOWS

Economic indicators in the pig production depend greatly on the results in the piglet production. One of the factors which have impact on the piglet production expenses is the period of the use of brood sows. Determining the optimal period of the sow usage is made through the assessment of the optimal number of the achieved farrows. In this paper, calculations of the prices have been made for produced piglets relative to the moment of exclusion from the reproduction process. Calculations show that the optimal period of the use of a sow, from the aspect of the minimal price 6 to 8 parities, while the price of a piglet increases afterwards. The advantage achieved by the high percentage of separation should not be neglected: faster introduction of new lines of gilts and less energy for meeting basic needs. On the other hand, apart from the decrease in the costs, low percentage of separation results in the low percentage of second-farrows, more fatlings per sow, lower percentage of gilts in the progeny, more space required for sows in reproduction stage and less difficulties during the gestation period

Influence of the use of food with addition of mineral adsorbents on economic results in chicken fattening

The aim of the research is to identify whether the mineral adsorbents added to the food of fattening chicken have impact on the cost-effectiveness of the fattening. The research was conducted on 400 fattening chicken, Cobb 500 provenience, divided into 4 groups, depending on the level of added mineral adsorbent: control group K (100 chicken, no mineral adsorbent added, 0,0%); experimental group O-I (100 chicken, with 0,5% of mineral adsorbents), experimental group O-II (100 chicken, with 0,2% of Processed mineral adsorbents) and experimental group O-III (100 chicken, with 0,3% of processed mineral adsorbents). Diet experiment lasted for 42 days. Results of the research show that chicken from O-I group had the best production results, followed by O-III, O-II and K as the poorest group. Calculations conducted during the work, it has been established that the addition of mineral adsorbents into the fattening chicken diet had very good effects on production and economic results

PROBLEMS OF AGRICULTURE OF THE REPUBLIC OF SERBIA AND MEASURES TO OVERCOME CRISIS

The authors discuss the current issues of agriculture of the Republic of Serbia, on the occasion of the world economic crisis, which negatively reflects on the agriculture. Agriculture is already in a long-term crisis, which manifests through its permanent unfavorable economic position. The authors distinguished four groups of problems: unfavorable structure of land possession and desorganisation of commodity producers; inordinateness of agricultural market; absence of competitivness; inadequate role of the state. The authors suggest measures and actions to stop the negative trends in agriculture