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Apparent Metabolizable Energy of Glycerin for Broiler Chickens^1,2,3

W. A. Dozier, III^*,4, B. J. Kerr, A. Corzo, M. T. Kidd, T. E. Weber and K. Bregendahl

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

⁴ Corresponding author: bdozier{at}msa-msstate.ars.usda.gov

Three energy balance experiments were conducted to determine AME_n of glycerin using broiler chickens of diverse ages. In experiment 1, two dietary treatments were fed from 4 to 11 d of age. Dietary treatments consisted of a control diet (no added glycerin) and a diet containing 6% glycerin (94% control diet + 6% glycerin). Four dietary treatments were provided in experiment 2 (from 17 to 24 d of age) and 3 (from 38 to 45 d of age). Diets in experiment 2 and 3 were 1) control diet (no added glycerin); 2) 3% added glycerin (97% control diet + 3% glycerin); 3) 6% added glycerin (94% control diet + 6% glycerin); and 4) 9% added glycerin (91% control diet + 9% glycerin). Diets in experiment 1 and 2 were identical, but the diet used in experiment 3 had reduced nutrient levels based on bird age. In experiments 2 and 3, broilers were fed 91, 94, 97, and 100% of ad libitum intake so that differences in AME_n consumption were only due to glycerin. A single source of glycerin was used in all experiments. Feed intake, BW, energy intake, energy excretion, nitrogen intake, nitrogen excretion, AME_n, and AME_n intake were determined in all experiments. In experiment 1, AME_n determination utilized the difference approach by subtracting AME_n of the control diet from AME_n of the test diet. In experiments 2 and 3, AME_n intake was regressed against feed intake with the slope estimating AME_n of glycerin. Regression equations were Y = 3,331x –72.59 (P 0.0001) and Y = 3,348.62x –140.18 (P 0.0001) for experiments 2 and 3, respectively. The AME_n of glycerin was determined as 3,621, 3,331, and 3,349 kcal/kg in experiments 1, 2, and 3, respectively. The average AME_n of glycerin across the 3 experiments was 3,434 kcal/kg, which is similar to its gross energy content. These results indicate that AME_n of glycerin is utilized efficiently by broiler chickens.

Key Words: broiler • metabolizable energy • glycerin

¹ Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the USDA, Iowa State University, or Mississippi State University.

² The term glycerol is discussed when it is produced from metabolism, whereas glycerin is used when it is produced from fats and oils as a by-product of manufacturing of soaps, fatty acids, and biofuel.

³ This is a corrected PDF showing the correct spelling of the last author's name (K. Bregendahl).

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