Use of Lipid-Extracted DDGS in Diets for Pacific White Shrimp



A series of trials (one growth trial and two digestibility trials) were conducted to evaluate the response of Pacific white shrimp Litopenaeus vannamei to the inclusion of lipid-extracted distillers dried grain with solubles (LE-DDGS). In the growth trial, a practical basal diet was developed for shrimp using soybean meal (56.76% diet) and fish meal (6% diet) as the primary protein sources. The LE-DDGS was substituted for soybean meal on an isonitrogenous basis at five levels of inclusion (0, 10, 20, 30, and 40%) with lysine supplemented to diets containing 30% and 40% LE-DDGS. A sixth diet containing 40% LE-DDGS but without a lysine supplement was also evaluated. The diets were offered to four replicate (15 shrimp/tank) groups of shrimp per treatment over an 8-week growth trial. At the end of the growth trial shrimp offered diets containing from 0% to 20% LE-DDGS performed similarly. Performance of shrimp fed higher levels of LE-DDGS was reduced but similar to each other. Removing the lysine supplement from the diet containing 40% LE-DDGS did not result in reduced performance of the shrimp, indicating lysine was not limiting in these feeds. In two digestibility trials, the LE-DDGS digestibility coefficients were determined in Pacific white shrimp for dry matter (ADMD), energy (AED), and crude protein (APD) using 1% chromic oxide as the inert marker with 70:30 replacement strategies. The ADMD, AED, and APD coefficient values for LE-DDGS were 53.77, 36.94, and 55.71 for digestibility trial 1 and 42.43, 44.65, and 20.87 for digestibility trial 2, respectively. Results from the digestibility data do not match the results of the growth trial, as poor digestibility would have resulted in more pronounced reduction in performance. Hence, this digestibility technique may not be appropriate for this type of ingredient. Based on the observed results the inclusion of LE-DDGS up to 20% of the diet is recommended.

Use of lipid-extracted distillers dried grain with solubles (DDGS) in diets for Pacific white shrimp

By Melanie A. Rhodes, Denghang Yu, Yangen Zhou, and D. Allen Davis. North American Journal of Aquaculture.