An integrated crop-livestock system (ICLS) is a practice of using crops and livestock on a single farm so that they complement each other in a variety of ways, including mitigating greenhouse gas (GHG) fluxes. Adoption of ICLS offers some major benefits in certain areas that include greater outputs and relatively fewer inputs, expense reduction, and increased ecosystem services. This study was conducted to evaluate the impact of cover crops and grazed cover crops under oat-maize rotation on GHG fluxes.