|Dozier Iii, William|
Submitted to: Poultry Science
Publication Type: Abstract Only
Publication Acceptance Date: 7/8/2007
Publication Date: 7/8/2007
Citation: Bregendahl, K., Lammers, P.J., Kerr, B.J., Honeyman, M.S., Stalder, K., Weber, T.E., Dozier III, W.A., Dion, K., Neal, M., Mottet, S. 2007. Metabolizable energy value of crude glycerin for laying hens [abstract]. Poultry Science. 86(Suppl.2):69(Abstr.). Interpretive Summary:
Technical Abstract: An experiment with laying hens was conducted to determine the apparent metabolizable energy-nitrogen corrected (AMEn) value of crude glycerin, a coproduct of biodiesel production. Crude glycerin (86.95% glycerol, 9.22% water, 0.03% methanol, 1.26% sodium, 3625 kcal/kg gross energy) was obtained from AG Processing Inc., Sergeant Bluff, IA. A total of forty eight, 40-wk-old laying hens (Hy-Line W-36) were placed in metabolic cages (2 hens/cage) in a light-controlled (16:8 L:D) room and given free access to the experimental diets. A basal diet (19% CP; 2922 kcal/kg AMEn) was formulated using corn, soybean meal, and meat and bone meal with 15% glucose and 1% Celite (to increase the content of acid-insoluble ash used as an indigestible marker). The 4 treatment diets were created by substituting 0, 5, 10, or 15% crude glycerin for glucose (3640 kcal/kg AMEn). After 7 d of dietary adaptation, excreta was collected twice daily for 3 d, freeze-dried, and analyzed for contents of DM, Kjeldahl N, acid-insoluble ash, and gross energy. Egg production was recorded daily, and eggs collected on Day 7 and 8 of the experiment were weighed for calculation of egg mass (egg production × egg weight). Feed consumption was measured over the entire 13-d-long experiment. Egg-production data were analyzed using ANOVA with 4 treatments and 6 replications in a completely randomized experimental design. The AMEn value of the crude glycerin was estimated as the slope of the linear relationship between the inclusion rate of dietary crude glycerin and the glucose-corrected AMEn value of the experimental diets. There were no treatment effects on the hens’ egg-production rate (93.0%), egg weight (56.1 g), egg mass (52.2 g/d), or feed consumption (104 g/d). Linear regression analysis (P < 0.001, r2 = 0.92, n = 24) showed that the AMEn value of the crude glycerin used in this study was 3805 kcal/kg; as-is basis) for laying hens. The results of this study show that the energy in crude glycerin is utilized with high efficiency by laying hens.