Kim E J, Amezcua C Martinez, Utterback P L, Parsons C M
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
Poult Sci. 2008 Apr;87(4):700-5. doi: 10.3382/ps.2007-00302.
There is currently much ongoing research and interest for developing new processing technologies to produce corn distillers dried grains with solubles (DDGS). The current study evaluated a high protein (HP) distillers dried grains (DDG) and a dehydrated corn germ, which are products that can be produced by a modified dry milling process. Two chick experiments were conducted to determine the P bioavailability based on tibia ash. In addition, precision-fed rooster assays were conducted to determine TME(n) and amino acid digestibility. In the first chick assay, a P-deficient cornstarch-dextrose-soybean meal basal diet containing 0.10 to 0.13% nonphytate P was supplemented with 0.0, 0.05, and 0.10% P from KH(2)PO(4) or 7 and 14% conventional DDGS, HP DDG, and corn germ. In the second experiment, the P-deficient basal was supplemented with 7 and 14% conventional DDGS and 12.5 and 25% HP DDG. New Hampshire x Columbian female chicks were fed the experimental diets from 9 to 22 d posthatch, and bioavailability of P was estimated using the slope-ratio method where tibia ash was regressed on P intake. The total P content (90% DM basis) of the conventional DDGS, HP DDG, and corn germ were 0.76, 0.33, and 1.29%, respectively. Bioavailabilities of the P in conventional DDGS, HP DDG, and corn germ relative to KH(2)PO(4) were found to be 60, 56, and 25%, respectively. The TME(n) in conventional roosters was found to be significantly reduced for HP DDG and increased for the corn germ when compared with the conventional DDGS. The protein content (90% DM basis) of the HP DDG and corn germ was 33 and 14%, respectively, and the total lysine as a % of CP was approximately 2 times greater for the corn germ than for the HP DDG. Amino acid digestibilities in cecectomized roosters were consistently higher for the corn germ than for the HP DDG, which was similar to conventional DDGS.
目前，对于开发用于生产玉米干酒糟及其可溶物（DDGS）的新加工技术，有许多正在进行的研究且备受关注。当前的研究评估了一种高蛋白（HP）干酒糟（DDG）和一种脱水玉米胚芽，它们是可通过改良干法碾磨工艺生产的产品。进行了两项雏鸡实验，以基于胫骨灰分来确定磷的生物利用率。此外，还进行了精确饲喂公鸡试验，以确定真代谢能（TME(n)）和氨基酸消化率。在第一次雏鸡试验中，一种含0.10%至0.13%非植酸磷的低磷玉米淀粉 - 葡萄糖 - 豆粕基础日粮，分别添加了0.0、0.05和0.10%来自磷酸二氢钾（KH₂PO₄）的磷，或7%和14%的传统DDGS、HP DDG和玉米胚芽。在第二个实验中，低磷基础日粮添加了7%和14%的传统DDGS以及12.5%和25%的HP DDG。新罕布什尔×哥伦比亚品系的雌性雏鸡在出壳后9至22天饲喂实验日粮，使用斜率比法估计磷的生物利用率，其中胫骨灰分与磷摄入量进行回归分析。传统DDGS、HP DDG和玉米胚芽的总磷含量（以90%干物质计）分别为0.76%、0.33%和1.29%。相对于磷酸二氢钾（KH₂PO₄），传统DDGS、HP DDG和玉米胚芽中磷的生物利用率分别为60%、56%和25%。与传统DDGS相比，发现传统公鸡中HP DDG的真代谢能（TME(n)）显著降低，而玉米胚芽的真代谢能增加。HP DDG和玉米胚芽的蛋白质含量（以90%干物质计）分别为33%和14%，玉米胚芽中总赖氨酸占粗蛋白的百分比约为HP DDG的2倍。在盲肠切除的公鸡中，玉米胚芽的氨基酸消化率始终高于HP DDG，这与传统DDGS相似。
