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Unpublished Paper
Metabolizable Energy Value of Crude Glycerol for Laying Hens
Animal Industry Report
  • Kristjan Bregendahl, Iowa State University
  • Peter J. Lammers, Iowa State University
  • Brian Kerr, United States Department of Agriculture
  • Mark S. Honeyman, Iowa State University
  • Kenneth J. Stalder, Iowa State University
  • William A. Dozier, III, United States Department of Agriculture
  • Thomas E. Weber, United States Department of Agriculture
  • Michael T. Kidd, Mississippi State University
Extension Number
ASL R2333
Publication Date
Summary and Implications
An experiment was conducted with laying hens to determine the nitrogen-corrected apparent metabolizable energy AMEn value of crude glycerol, a co-product of biodiesel production. Crude glycerol (87% glycerol, 9% water) was obtained from a commercial biodiesel production facility. A total of 48 40-week-old laying hens (Hy-Line W-36) was placed in metabolic cages (2 hens/cage) and given free access to the experimental diets. A corn and soybean meal–based basal diet was formulated with 15% glucose•H2O. Four dietary treatments were created by substituting 0, 5, 10, or 15% crude glycerol for glucose•H2O (3,640 kcal/kg AMEn). After 7 days of dietary adaptation, excreta were collected twice daily for 3 days, freeze-dried, and analyzed for contents of dry matter, nitrogen, acid-insoluble ash, and gross energy. Egg production was recorded daily, and eggs were collected on days 7 and 8 of the experiment for calculation of egg mass (egg production × egg weight). No significant treatment effects (P > 0.1) were apparent for egg-production rate (93.0%), egg weight (56.1 g), egg mass (52.2 g/d), or feed consumption (104 g/d). Linear regression analysis (P < 0.001, r 2 = 0.92, n = 24) revealed that the AMEn value of the crude glycerol used in this study was 3,805 kcal/kg (asis basis) for laying hens, slightly higher than that reported for corn grain and less than half of that reported for vegetable oil.
Copyright Holder
Iowa State University
Citation Information
Kristjan Bregendahl, Peter J. Lammers, Brian Kerr, Mark S. Honeyman, et al.. "Metabolizable Energy Value of Crude Glycerol for Laying Hens" (2008)
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