Abstract
Three trials were conducted to determine differences in particle size characteristics of corn processed with a hammer mill vs. that processed with a roller mill. The particle size (geometric mean diameter) for corn processed with the roller mill ranged from 1,343 to 1,501 μm whereas that of corn processed with the hammer mill ranged from 814 to 873 μm. The trials demonstrated that the differing particle size characteristic of feed milled with hammer mill versus roller mill did not significantly influence the performance of commercial laying hens as measured by body weight, percentage of hen-day egg production, egg weight, average daily feed consumption, feed efficiency (grams of feed per gram egg produced), egg shell breaking strength, or mortality.
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