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During the last century, the emission of nitrous oxide (N2O) from the livestock sector increased significantly. N2O is a greenhouse gas with 298-fold higher global warming potential (GWP) than CO2. Pigs accounted for about 26% of N2O emissions. The formation of N2O occurs through nitrification and denitrification processes in manure. This study aimed to estimate N2O production in the manure of growing-finishing pigs by using our experimental data in the model. The associative effects of dietary mustard and grapeseed oil cakes (MxG), as an alternative for sunflower meal (SFM), on performance and efficiency traits were also determined. Forty growing-finishing pigs were randomly allocated in two groups (2 replicates per group) fed two diets: C diet (based on SFM, 15 wt) and E diet (based on M and G mixture, 7:8 wt:wt). Our model includes as initial input data: body weight (BW), feed intake, nitrogen intake, dietary dry matter, and fibre intake. Using literature prediction equations, including total nitrogen output (TNO) as the main parameter, we established N2O production expressed as equivalent CO2 (E-CO2). A decline with 3% for BW (P=0.44), respectively 9.0% for average daily gain (ADG, P=0.21) in pigs given MxG was recorded. Correlated with growth parameters, efficiency traits (feed intake, feed: gain ratio, N and fibre intake) were decreased as well (P>0.05). Dietary addition of MxG led to a 5% lower level of N2O production in manure. The reduction of TNO was not significant (<7.14% in the E diet compared to the C diet). In our trial, a relatively low N intake percentage is retained in the pigs body (35.56% in the C group and 35.98% in the E group, P>0.05). Based on these results, we conclude that the inclusion of 15% MxG mixture in pigs diets, although slightly declining growth parameters, is a valuable nutritional solution by their contribution to lowering N2O and N output in the manure. [ABSTRACT FROM AUTHOR]

Simple Summary: The metabolic response of pigs to nutritional treatment was highlighted in a variety of ways. Since the literature related to the effects of an n-3-rich diet on product quality have shown a number of health advantages, one of the next steps could be the consideration of the relation between an n-3 polyunsaturated fatty acid (PUFA)-rich diet and nutrient metabolism with a focus on nitrogen as an important indicator of protein synthesis and degradation. It is important to understand how unconventional diets affect the environment with respect to consumer demand regarding the quality of products and the health status of animals. Therefore, novel compound feed formulas to improve feeding efficiency by decreasing the n-6:n-3 fatty acid ratio are needed. However, it is assumed that by changing the fatty acid profile, certain plasma or tissue parameters could be directly affected as well. In our study, we modified the n-6:n-3 ratio in different barrow tissues by the dietary addition of extruded linseed associated with walnut meal employing a mixture of 50:50 (wt/wt) n-3 fatty acids as dietary enrichment. This paper also gives information about the influence of extruded linseed/walnut meal mixture on performance and nitrogen metabolism in barrows. We investigated changes in nitrogen metabolism and chemical, fatty acid (FA) and amino acid (AA) composition in tissues (longissimus dorsi (LD) and semitendinosus (ST) muscles, heart, spleen, liver and cecum) following the dietary addition of extruded linseed and walnut meal (50:50 mix). Plasma creatinine and urea nitrogen were determined as well. Two trials were designed using barrows (five replicates) allotted in two groups [(control, (SM) and experimental, (LEW))] in metabolic cages. The experimental diet rich in n-3 FA led to a significant increase of retained nitrogen (>8.09% in the LEW group). The biological value of feed protein was 14.8% higher in the LEW group than in the SM group. LD muscles from the SM group and liver from the LEW group had greater nitrogen contents, whereas the heart and spleen had lower concentrations of nitrogen in the LEW group. Diet had a pronounced effect on n-3 FA, particularly on α-linolenic fatty acid (ALA) (p < 0.0001). The highest levels of ALA were recorded in the cecum (>6.06 times in LEW) and heart (>5.44 times in LEW). The highest level of lysine was noticed in the LD muscle (>2.1% in SM). An n-3-rich diet significantly reduced the amount of nitrogen excreted; greater than 40% nitrogen was retained, thus improving the meat composition. [ABSTRACT FROM AUTHOR]