Metabolizable energy value of dried corn distillers grains and corn distillers grains with solubles for 6-week-old broiler chickens
2012
Adeola, O. | Zhai, H.
The objective of this study was to determine the ileal digestible energy (IDE), ME, and MEn contents of corn distillers grains (DDG) and corn distillers grains with solubles (DDGS) for 6-wk-old broiler chickens using a multiple linear regression method. The DDG and DDGS were incorporated into a corn-soybean meal-based reference diet at 3 levels (0, 300, or 600 g/kg) by replacing the energy-yielding ingredients. These 5 diets were fed to 120 male Ross 308 broilers from d 35 to 42 posthatch with 3 birds per cage and 8 replicate cages per diet in a randomized complete block design. The birds were fed a standard broiler starter diet from d 1 to 22 posthatch and a standard broiler grower diet from d 22 to 35 posthatch. The inclusion of DDG and DDGS linearly (P < 0.001) decreased ileal digestibility of DM, energy, and IDE. Supplementation of DDG (linearly and quadratically; P < 0.05) or DDGS (linearly; P < 0.05) decreased metabolizability of DM, N, energy, N-corrected energy, and ME and MEn. By regressing the DDG and DDGS-associated IDE intake in kilocalories against kilograms of DDG and DDGS intake, the IDE regression equation was Y = –19 + 2,428 x DDG + 2,922 x DDGS, r2 = 0.97, which indicates IDE values of 2,428 kcal/kg of DM for DDG and 2,922 kcal/kg of DM for DDGS. Similarly, the ME regression equation was Y = –24 + 2,279 x DDG + 2,800 x DDGS, r2 = 0.98, which implies ME values of 2,279 kcal/kg of DM for DDG and 2,800 kcal/kg of DM for DDGS. For MEn, the regression equation was Y = –20 + 2,176 x DDG + 2,688 x DDGS, r2 = 0.98, which suggests MEn values of 2,176 kcal/kg of DM for DDG and 2,688 kcal/kg of DM for DDGS. The IDE, ME, and MEn values of DDGS were higher (P < 0.01) than those of DDG. From these values, we calculated the advantages in IDE, ME, and MEn of DDGS over DDG used in this study to be 20, 23, and 24%, respectively.
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