Investigation of trends in N2O gas emission from livestock’s husbandry in Iran

Climate change resulting from greenhouse gas emissions has endangered the life of humans. One of these atmospheric pollutants is N2O, which has a lifespan of 165 years and is roughly 310 times more efficient at trapping heat than CO2. Therefore, the aim of this study was to determine the amount of N2O production by domestic animals in Iran.The number of livestock in the last decade, was obtained from the Ministry of Jihad-e-Agriculture.Domestic animals were divided into five experimental treatments: the cows group, the small-ruminants group, the large-livestock’s group, the industrial-poultry group and the other-poultry group.Then, using IPCC software (Tier 1), the amount of N2O emissions from domestic animal husbandry was obtained. Data wereanalyzedaccording to acompletely randomized design usingSAS software.The covariance among the considered years was estimated using repeated measurementsanalysis intimes.The amounts of N2O emissions in 2017 were 6.34, 79.87, 1.26, 1452.71, and 7.15 million tons, respectively. Total emissions of this gas, feed intake and productions livestock’s during the last decade were about 128.13 Gg/Year, 605.72 million tons and 118.37 million tons, respectively. The covariance structure of emissions was unstructured and heterogeneous among the studied years. It seems that the industrial poultry section is the main producer of N2O gas. Therefore, special scientific attention should be made to optimize the poultry manure management.