Nutrition IV
نویسندگان
چکیده
Crude glycerin is a co-product from biodiesel production. In 2006, approximately 250,000 million gallons of biodiesel were produced, which translates to 75,000 metric tons of glycerin. Glycerin contains approximately 3,650 kcal/kg of gross energy and, as such, it may be a potential dietary energy source for poultry. Three energy balance experiments were conducted to determine AMEn of glycerin using broiler chickens of diverse ages. In experiment (Exp.) 1, 2 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 Exp. 2 (from 17 to 24 d of age) and 3 (from 38 to 45 d of age). Diets in Exp. 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); 4) 9% added glycerin (91% control diet + 9% glycerin). Diets in Exp. 1 and 2 were identical. The diet used in Exp. 3 had reduced nutrient levels based on bird age. In Exp. 2 and 3, broilers were fed 91, 94, 97, and 100% of ad libitum intake so that differences in AMEn consumption were only due to glycerin. A single source of glycerin was used in all experiments. In Exp. 1, AMEn determination utilized the difference approach by subtracting AMEn of the control diet from AMEn of the test diet. In Exp. 2 and 3, AMEn intake was regressed against feed intake with the slope estimating AMEn of glycerin. Regression equations were Y = 3,331x – 72.59 (P ≤ 0.0001) and Y = 3,349x – 140.18 (P ≤ 0.0001) for Exp. 2 and 3, respectively. The AMEn of glycerin was determined as 3,621, 3,331, and 3,349 kcal/kg in Exp. 1, 2, and 3, respectively. The average AMEn of glycerin across the 3 experiments was 3,434 kcal/kg, which is similar to its gross energy content. These results indicate that AMEn of glycerin is utilized efficiently by broiler chickens.
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