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Journal of Animal Science Abstract - Nonruminant Nutrition

Digestible and metabolizable energy of crude glycerol for growing pigs12


This article in

  1. Vol. 86 No. 3, p. 602-608
    Received: July 24, 2007
    Accepted: Dec 05, 2007
    Published: December 5, 2014

    3 Corresponding author(s):

  1. P. J. Lammers*,
  2. B. J. Kerr†3,
  3. T. E. Weber,
  4. W. A. Dozier III,
  5. M. T. Kidd§,
  6. K. Bregendahl* and
  7. M. S. Honeyman*
  1. Department of Animal Science, Iowa State University, and
    USDA-ARS, Swine Odor and Manure Management Research Unit, Ames, IA 50011-3310;
    USDA-ARS Poultry Research Unit; and
    Department of Poultry Science, Mississippi State University, Mississippi State, MS 39762-9665


The apparent DE and ME values of crude glycerol for growing pigs were determined in 5 experiments using crude glycerol (86.95% glycerol) from a biodiesel production facility, which used soybean oil as the initial feedstock. Dietary treatments were 0, 5, or 10% glycerol addition to basal diets in Exp. 1; 0, 5, 10, or 20% glycerol addition to basal diets in Exp. 2; and 0 and 10% crude glycerol addition to the basal diets in Exp. 3, 4, and 5. Each diet was fed twice daily to pigs in individual metabolism crates. After a 10-d adjustment period, a 5-d balance trial was conducted. During the collection period, feces and urine were collected separately after each meal and stored at 0°C until analyses. The GE of each dietary treatment and samples of urine and feces from each pig were determined by isoperibol bomb calorimetry. Digestible energy of the diet was calculated by subtracting fecal energy from the GE in the feed, whereas ME was calculated by subtracting the urinary energy from DE. The DE and ME values of crude glycerol were estimated as the slope of the linear relationship between either DE or ME intake from the experimental diet and feed intake. Among all experiments, the crude glycerol (86.95% glycerol) examined in this study was shown to have a DE of 3,344 ± 8 kcal/kg and an ME of 3,207 ± 10 kcal/kg, thereby providing a highly available energy source for growing pigs.

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