Pedersen C, Boersma M G, Stein H H
Department of Animal and Range Sciences, South Dakota State University, Brookings 57007, USA.
J Anim Sci. 2007 May;85(5):1168-76. doi: 10.2527/jas.2006-252. Epub 2007 Jan 15.
An experiment was conducted to measure DE and ME and the apparent total tract digestibility (ATTD) of energy, N, and P in distillers dried grains with solubles (DDGS) fed to growing pigs. Ten sources of DDGS were obtained from ethanol plants in South Dakota and Minnesota, and 11 diets were formulated. One diet was based on corn (96.8%), limestone, salt, vitamins, and microminerals. 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 of 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 1 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 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 of DE/kg of DM and 3,674 to 4,336 kcal of ME/kg of DM). The average DE and ME in DDGS were 4,140 and 3,897 kcal/kg of DM, respectively. These values were not different from the DE and ME in corn (4,088 and 3,989 kcal/kg of 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.
进行了一项实验，以测定用含可溶物的干酒糟（DDGS）饲喂生长猪时，能量、氮和磷的消化能（DE）、代谢能（ME）以及表观全肠道消化率（ATTD）。从南达科他州和明尼苏达州的乙醇工厂获取了10种DDGS来源，并配制了11种日粮。一种日粮以玉米（96.8%）、石灰石、盐、维生素和微量矿物质为基础。通过将玉米日粮与10种DDGS来源中的每一种按1:1的比例混合，又配制了10种额外的日粮。11头生长猪（初始体重为29.3±0.42千克）被分配到一个11×11拉丁方设计中，有11个时间段和11头猪。在1个时间段内，将11种日粮中的每一种喂给每头猪。将猪放置在代谢笼中，以便分别收集全部粪便和尿液。分析样品中的总能（GE）、氮和磷以及能量和氮平衡，并计算每种日粮的GE、氮和磷的ATTD。通过减去玉米日粮对含DDGS日粮的贡献，计算出每种DDGS来源的能量和氮平衡以及GE、氮和磷的ATTD。实验结果表明，10种DDGS来源之间的DE和ME存在差异（P<0.001）（DE为3947至4593千卡/千克干物质，ME为3674至4336千卡/千克干物质）。DDGS中的平均DE和ME分别为4140和3897千卡/千克干物质。这些值与玉米中的DE和ME（分别为4088和3989千卡/千克干物质）没有差异。根据分析的DDGS的GE和营养成分以及计算出的DE和ME值，建立了DE和ME的预测方程。这些方程表明，DDGS中的DE和ME可以根据灰分、乙醚提取物、酸性洗涤纤维（ADF）和GE的浓度来预测。DDGS中氮的保留量比玉米中的更大（P<0.001），但按百分比计算时，DDGS和玉米之间的氮保留量没有差异。10个样品中DDGS中磷的ATTD平均为59.1%。这个值比玉米中磷的ATTD（19.3%）更大（P<0.001）。得出的结论是，DDGS中的DE和ME与玉米中的DE和ME没有差异。然而，如果在生长猪的日粮中包含DDGS，有机磷的更大比例将被消化和吸收，从而减少向日粮中添加无机磷的需要。
