The establishment of a nitrogen and phosphorus circular economy system will reduce imported nutrient volumes, prevent environmental pollution, and solve resource security while providing an opportunity to reevaluate livestock farming and livestock manure. Looking at the reality of livestock farming in our country, one cannot help but feel deeply sorrowful. Livestock, which produces beef, milk, chickens, and eggs, is responsible for the nation's health and accounts for over 40% of total agricultural production, yet it is perceived more as a source of environmental pollutants rather than being recognized for its industrial value and function.
Regarding environmental issues frequently mentioned in the livestock sector, these include greenhouse gas emissions such as methane and nitrous oxide, nutrient accumulation of nitrogen and phosphorus, and water pollution.