Apparatus and a method for monitoring animal exhalation, to provide an indication of the condition of an animal is disclosed. Apparatus for collection and temporary or permanent storage of animal exhalation sample is disclosed, together with apparatus for conditioning a sample prior to analysis. A method of conditioning a sample prior to analysis is also disclosed. Use may be made of the above mentioned apparatus and method in the diagnosis of the condition of an animal. Conditions of interest include metabolic conditions of animals such as dairy cattle; these can be monitored by measuring analytes in the exhaled breath, emanations from the milk or both. Use may also be made of said apparatus and method in the detection of antibodies present in samples of blood, milk and mucus particulates in exhaled breath. It is preferred that the monitoring apparatus is portable.
