Emission of CO2 in a livestock barn based on diurnal activities and various growing stages of pigs

The carbon dioxide (CO 2 ) emissions from pig barns are increasing persistently as a result of increasing pig farming due to the growing demand of pork, which is a great concern for rising greenhouse gases (GHGs) in the atmosphere. Therefore, the objective of this study was to measure the CO 2 emissions with respect to the diurnal activities among different growing stages of pigs. Two experiments were conducted in an experimental pig barn in 2020 and 2021 to estimate the CO 2 emissions in response to their activities and growing stages. A livestock environment management system (LEMS) was used to measure the concentration of CO 2 inside the barn. A camera with a network video recorder was used to record the activities of pigs on a diurnal basis. Our results showed that the lowest CO 2 emissions were found in the fattening stage 1 (age 61–81 days) while the highest CO 2 emissions were resulted from the fattening stage 4 (age 124–144 days). Moreover, among the four fattening stages, CO 2 emissions levels were significantly different from each other (p