DISTILLERS DRIED GRAINS WITH SOLUBLES (DDGS) AND THE USE OF PHYTASE TO ADDRESS DIGESTIBILIY ISSUES IN PIGS

摘要

Distillers dried grains with solubles (DDGS) and other co-products from the fuel ethanol industry may be used in diets fed to swine without compromising pig performance. Because DDGS and high protein distillers dried grain (HP DDG) are fermented during production of ethanol, the digestibility of phosphorus in these co-products is much greater than in corn and corn germ that have not been fermented. The standardized total tract digestibility (STTD) of P in DDGS and HP DDG may, therefore, exceed 70%, whereas the STTD of P in corn and corn germ usually is less than 40%. If microbial phytase is added to the products, STTD values for DDGS and HP DDG may exceed 80%. Because of this high digestibility of P and because of the relatively high concentration of P in DDGS, no inorganic P is needed in diets fed to weanling pigs from approximately 11 kg if the combination of DDGS and microbial phytase is added to the diet. Diets containing both DDGS and phytase will support pig growth performance that is similarto that of pigs fed diets containing corn, soybean meal, and dicalcium phosphate, but the excrétion of P from the pigs is reduced by approximately 50%.