Corn Distillers Dried Grains with Solubles in Growing-Finishing Swine Rations

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Abstract
Three experiments were conducted with a total of 212 crossbred pigs, averaging initially 17.5 to 19.2 kg, to determine the effect of 5, 10 and 20% corn distillers dried grains with solubles (DDGS) on gain, feed consumption, feed conversion and nutrient digestibility and to study the effect of lysine and fat supplementation to these diets. There were no significant differences in average daily gain or feed intake due to variation in DDGS levels in experiment 1. However, feed conversion was significantly poorer with the 20% DDGS diet. Average apparent digestibility of protein, nitrogen-free extract and dry matter was reduced significantly by the 20% level of DDGS. Digestibility of these nutrients in the 5% DDGS diet was not affected. Apparent digestibility of protein was significantly reduced in two of the three collection periods and nitrogen-free extract and dry matter were significantly less at the third collection period for the diet containing 10% DDGS when compared to the control diet. Pigs fed isocaloric diets containing 0, 5, 10 or 20% DDGS did not differ significantly in average daily gain, feed intake or feed conversion efficiency in experiment 2. However, pigs fed the 20% DDGS diet did require about 18% more feed per unit of gain. Supplementing all of these diets with lysine to a level of 0.75% did not affect performance significantly although the feed conversion efficiency of pigs fed 20% DDGS improved from 3.28 to 2.89. In a third experiment barrows and gilts were fed separately the corn-soybean meal diet and the 20% DDGS diet supplemented with 0, 0.15 and 0.25% lysine. Average daily gain was significantly (P<.01) less with the unsupplemented 20% DDGS diet and feed/ gain was significantly (P<.05) poorer. Lysine supplementation improved the 20% DDGS diet for both growth rate and feed efficiency. These data indicate that levels of 5 or 10% DDGS can be fed in corn-soybean meal rations without adversely affecting rate of gain or feed efficiency. A level of 20% DDGS reduces digestibility of protein, NFE and dry matter as well as gain and feed efficiency, probably due, at least in part, to a low lysine level. Supplementing with lysine to obtain a level of 0.65% lysine in the diet appeared to be adequate. Copyright © 1970. American Society of Animal Science . Copyright 1970 by American Society of Animal Science

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