Digestibility of energy and phosphorus in 10 samples of distillers dried grain with solubles fed to growing pigs

¹ Department of Animal and Range Sciences, South Dakota State University, Brookings 57007

^* To whom correspondence should be addressed. E-mail: hstein{at}uiuc.edu.

	Abstract

An experiment was conducted to measure DE and ME and the apparent total tract digestibility (ATTD) of energy, N, and P in distillers dried grain with solubles (DDGS) fed to growing pigs. Ten sources of DDGS were obtained from ethanol plants located in South Dakota and Minnesota and 11 diets were formulated. One diet was based on corn (96.8%), limestone, salt, vitamins, and micro minerals. Ten additional diets were formulated by mixing the corn diet and each of the 10 sources of DDGS in a 1:1 ratio. Eleven growing pigs (initial BW: 29.3 ± 0.42 kg) were allotted to an 11 x 11 Latin square design with 11 periods and 11 pigs. Each of the 11 diets was fed to each pig during one period. Pigs were placed in metabolism cages that allowed for the total, but separate, collection of feces and urine. Samples were analyzed for GE, N, and P, and the energy and N-balances and the ATTD of GE, N, and P were calculated for each diet. By subtracting the contribution from the corn diet to the DDGS-containing diets, the energy and N-balances and the ATTD for GE, N, and P for each source of DDGS were calculated. Results of the experiment showed that the DE and ME differed (P < 0.001) among the 10 sources of DDGS (3,947 to 4,593 kcal DE per kg DM and 3,674 to 4,336 kcal ME per kg DM, respectively). The average DE and ME in DDGS were 4,140 and 3,897 kcal per kg DM, respectively. These values were not different from the DE and ME in corn (4,088 and 3,989 kcal per kg DM, respectively). Based on the analyzed GE and nutrient composition of DDGS and the calculated values for DE and ME, prediction equations for DE and ME were developed. These equations showed that DE and ME in DDGS may be predicted from the concentration of ash, ether extract, ADF, and GE. The retention of N from DDGS was greater (P < 0.001) than from corn, but when calculated on a percentage basis, the N-retention did not differ between DDGS and corn. The ATTD of P in DDGS was 59.1% on average for the 10 samples. This value was greater (P < 0.001) than the ATTD of P in corn (19.3%). It is concluded that the DE and ME in DDGS is not different from the DE and ME in corn. However, if DDGS is included in diets fed to growing swine, a greater portion of the organic P will be digested and absorbed, thus reducing the need for adding inorganic P to the diets.

Key Words: digestibility, distillers dried grain with solubles, energy, pigs, phosphorus, prediction equations

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