Odour Production, Evaluation and Control

Odour Production, Evaluation and Control

Over 168 odour compounds have been identified in livestock odours. These individual odour compounds may be measured with analytical instrument such as GC or GC/MS, but there is no established correlation between the individual odour compounds and the human perception of odour. The most reliable way of measuring odour is using the human olfactory sense (nose). Dynamic-dilution olfactometers with trained human assessors are considered to be the industry standard for measuring odour concentration. However, there are considerable inconsistencies in the design and operation of olfactometers. A national standard should be developed, or existing standards, such as the European Union Standard, should be adopted, to provide guidelines for conducting olfactometry measurements of livestock odours. The human sniffing technique shows the potential of evaluating odour directly in the field. This technology is relatively inexpensive and may be adopted by various levels of regulatory agencies for evaluating odour complaints.

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