This publication is a review of the information available on stored manure . Manure under storage will undergo composition changes particularly for its carbon/nitrogen (C/N) ratio. For liquid manure, a higher C/N ratio will reduce N losses under the form of ammonia. Nitrous oxide gas (NOx) emissions also occur. Changes in the manure composition will happen and seasonal variations play a role in the process as for low temperature, the anaerobic bacteria slow their activity.