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Thin-Layer Drying Rates, Stress Cracking, and Digestibility of Selected High-Oil Corn Hybrids
Transactions of the ASAE (2001)
  • Adam E. Watkins, Purdue University
  • Dirk E. Maier, Purdue University
Thin-layer drying tests were conducted on samples of five high-oil corn hybrids harvested from a private plot in 1997. Samples were dried at temperatures ranging from 38 ° C to 104 ° C, dew-point temperature of 19 ° C, and airflow rate of 7.2 m 3 /min. Corn was dried from initial moisture contents of 20.2% to 20.9% w.b., to final moisture contents of approximately 15% w.b. Half of the sample from each drying temperature was cooled rapidly with 4 ° C forced air, and half was tempered for one hour before cooling to room temperature non-evaporatively in sealed plastic bags. Stress cracks were counted on 100 kernels from each sample. Differences in stress-crack indices between hybrids due to drying and cooling treatments ranged from 22% to 34%. Equilibrium moisture content was calculated using the modified Henderson equation. Final moisture ratios were then used to estimate drying rates. Hybrid differences in drying rates of 10% to 15% were observed. Digestibility tests with ducks were performed on samples of a single hybrid from each drying temperature. Apparent metabolizable energy, apparent nitrogen retained, and dry matter retained were analyzed. No significant differences in digestibility between drying temperatures were detected with the hybrid that was tested.
  • Stress crack index,
  • Grain drying,
  • Cooling rate,
  • Quality,
  • Tempering
Publication Date
Publisher Statement
Copyright 2001 American Society of Agricultural and Biological Engineers. Used with permission.
Citation Information
Adam E. Watkins and Dirk E. Maier. "Thin-Layer Drying Rates, Stress Cracking, and Digestibility of Selected High-Oil Corn Hybrids" Transactions of the ASAE Vol. 44 Iss. 3 (2001) p. 617 - 622 ISSN: 0001-2351
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