Abstract
Two odor evaluation methods were tested during a 12-week dynamic experiment on the effects of a commercial additive on swine manure in anaerobic storage. One method was a rating method which combined many of the best features of past research methods. The other method was a ranking method which was designed to limit the effects of odor fatigue. Manure was collected daily from growing-finishing pigs and added to barrels at a rate corresponding to the volume of manure that would fall on the barrel area in a typical swine pit. Odors were analyzed weekly by human sniffers and detector tubes were used to measure ammonia, amines, and hydrogen sulfide. The manure was also analyzed for total solids content. Results showed that the magnitude estimation rating method could distinguish between odor levels when there was a significant difference in odor levels. The ranking method distinguished a difference between the highest treatment level and untreated manure which may indicate that it is a more precise method but was of limited use on its own because it did not give the magnitude of the difference.
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