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Regarding hourly patterns, horses preferentially spent more time on eating and chewing the long hay than on the hay cubes. Increased cube feed rates correlated with a higher density of inhalable dust (under 100 micrometers), but not with a corresponding increase in thoracic dust (under 10 micrometers). Nevertheless, the generally low dust levels in both the cubes and the hay suggested good hygienic standards for both materials. The data suggests that overnight feeding of alfalfa-