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ARS Home » Midwest Area » Ames, Iowa » National Laboratory for Agriculture and The Environment » Agroecosystems Management Research » Research » Publications at this Location » Publication #203840

Title: Nutritional Value of Crude Glycerin for Nonruminants

item Kerr, Brian
item Dozier Iii, William

Submitted to: Journal of Animal Science
Publication Type: Proceedings
Publication Acceptance Date: 11/13/2007
Publication Date: 11/13/2007
Citation: Kerr, B.J., Dozier III, W.A., Bregendahl, K. 2007. Nutritional Value of Crude Glycerin for Nonruminants. In: Proceedings of 23rd Annual Carolina Swine Nutrition Conference, November 13, 2007, Raleigh, North Carolina. p. 6-18.

Interpretive Summary:

Technical Abstract: The apparent metabolizable energy value of crude glycerol, a co-product of biodiesel production, was determined in two studies conducted at the ISU Swine Nutrition Farm, Ames, IA. In the first study, 24 barrows with an average body weight (BW) of 11.0 ±0.5kg were fed 376 g/d of a basal diet combined with either 0, 19, 38, or 75 g/d of crude glycerol. In the second study, 23 gilts with an average BW of 109.6 ±5.5 kg were fed 2.29 kg/d of a basal diet combined with either 0, 115, 229, or 458 g/d of crude glycerol. The crude glycerol contained 86.95% glycerol and was obtained from Ag Processing Inc., Sergeant Bluff, IA. Dietary treatments for each study equated to 0, 5, 10, or 20% glycerol addition to basal diets. Each diet was fed to six pigs in individual metabolism stalls. Pigs were fed twice daily. Following a 10 d adjustment period, total collection of feces and urine occurred. Feces and urine were separately collected following each meal and stored at 0°C. Gross energy values of each dietary regime and urine and feces from each pig were determined by adiabatic bomb calorimetry. Apparent metabolic energy (ME) value of crude glycerol was calculated by subtracting the energy in feces and urine from the gross energy (GE) of the feed. Dietary treatment and BW of the animal did not affect apparent ME value in pigs (P < 0.01). Apparent ME of the crude glycerol sample examined was 3736 ±72 kcal/kg as fed. Apparent ME for crude glycerol is approximately 9% more than apparent ME for corn grain. Crude glycerol may be a source of energy for growing pigs. Studies elucidating growth, performance, and carcass characteristics for pigs fed crude glycerol are needed to determine the economic value of crude glycerol as a feedstuff for pigs.