Digestible and metabolizable energy of crude glycerol for growing pigs

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Lammers, P. J.
Kerr, B. J.
Webber, T. E.
Dozier, W. A.
Kidd, M. T.
Bregendahl, K.
Honeyman, Mark
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Iowa Agriculture and Home Economics Experiment Station
Established at Iowa State in 1888, the Experiment Station fulfilled a Congressional charge for land-grant universities to develop research projects to advance practical science for the citizens of their states. The Experiment Station is not a building or location. It is a program of research that is supported in part with funding from the U.S. Department of Agriculture National Institute of Food and Agriculture and the State of Iowa. At Iowa State University, these public investments support research aimed at solving our state's most pressing concerns in the areas of food safety, food security, natural resource stewardship, and the economic health of Iowa communities.
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Agricultural Education and Studies

The Department of Agricultural Education and Studies was formed in 1989 as a result of the merger of the Department of Agricultural Education with the Department of Agricultural Studies. Its focus includes two these fields: agricultural education leading to teacher-certification or outreach communication; and agricultural studies leading to production agriculture or other agricultural industries.

The Department of Agricultural Education and Studies was formed in 1989 from the merger of the Department of Agricultural Education and the Department of Agricultural Studies.

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Animal Science

The Department of Animal Science originally concerned itself with teaching the selection, breeding, feeding and care of livestock. Today it continues this study of the symbiotic relationship between animals and humans, with practical focuses on agribusiness, science, and animal management.

The Department of Animal Husbandry was established in 1898. The name of the department was changed to the Department of Animal Science in 1962. The Department of Poultry Science was merged into the department in 1971.

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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.


The version of record: Lammers, P. J., B. J. Kerr, T. E. Weber, W. A. Dozier III, M. T. Kidd, K. Bregendahl, and M. S. Honeyman. "Digestible and metabolizable energy of crude glycerol for growing pigs." Journal of Animal Science 86, no. 3 (2008): 602-608. is available online at DOI: 10.2527/jas.2007-0453. Posted with permission.