The impact of saponins addition to the feed of pigs (pre-fattening period) on emissions of selected greenhouse gases (CO2, CH4, NH3) in the air and in manure is discussed in the methodology. The appropriate doses of saponins for pig feed were determined. Gas concentrations are measured, as well as nitrogen content, including ammonium nitrogen, in pig manure and in the barn air. The results are evaluated with regard to the increase of pig live weight. In the second part of the methodology, the impact of pig slurry on CO2 emissions after being incorporated into the soil is evaluated, where the slurry was compared with CO2 emissions from other fertilizers such as urea or digestate. From the perspective of CO2 emissions, the combined incorporation with straw was also assessed.
Based on the results achieved, recommendations were developed for reducing emissions of selected greenhouse gases both during the pre-fattening period and for the application of liquid manure and liquid organic fertilizers to the soil. At the same time, the results were evaluated from both an environmental and financial perspective.