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This Article Full Text Full Text (PDF) All Versions of this Article: jas.2007-0453v1 86/3/602    most recent Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Lammers, P. J. Articles by Honeyman, M. S. PubMed PubMed Citation Articles by Lammers, P. J. Articles by Honeyman, M. S.

Digestible and metabolizable energy of crude glycerol for growing pigs^1,2

P. J. Lammers^*, B. J. Kerr^,3, T. E. Weber, W. A. Dozier, III, M. T. Kidd, K. Bregendahl^* and M. S. Honeyman^*

^* Department of Animal Science, Iowa State University, and and USDA-ARS, Swine Odor and Manure Management Research Unit, Ames, IA 50011-3310; and USDA-ARS Poultry Research Unit; and and Department of Poultry Science, Mississippi State University, Mississippi State, MS 39762-9665

³ Corresponding author: brian.kerr{at}ars.usda.gov

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.

Key Words: biofuel • crude glycerol • metabolizable energy • pig