State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, People's Republic of China.
J Anim Sci Biotechnol. 2013 Sep 25;4(1):38. doi: 10.1186/2049-1891-4-38.
This study was conducted to evaluate the apparent metabolizable energy (AME) and true metabolizable energy (TME) contents in 30 sources of corn distillers dried grains with solubles (DDGS) in adult roosters, and establish the prediction equations to estimate the AME and TME value based on its chemical composition and color score.
Twenty-eight sources of corn DDGS made from several processing plants in 11 provinces of China and others imported from the United States. DDGS were analyzed for their metabolizable energy (ME) contents, measured for color score and chemical composition (crude protein, crude fat, ash, neutral detergent fiber, acid detergent fiber), to predict the equation of ME in DDGS. A precision-fed rooster assay was used, each DDGS sample was tube fed (50 g) to adult roosters. The experiment was conducted as a randomized incomplete block design with 3 periods. Ninety-five adult roosters were used in each period, with 90 being fed the DDGS samples and 5 being fasted to estimate basal endogenous energy losses.
Results showed that the AME ranged from 5.93 to 12.19 MJ/kg, TME ranged from 7.28 to 13.54 MJ/kg. Correlations were found between ME and ash content (-0.64, P < 0.01) and between ME and yellowness score (0.39, P < 0.05) of the DDGS samples. Furthermore, the best-fit regression equation for AME content of DDGS based on chemical composition and color score was AME = 6.57111 + 0.51475 GE - 0.10003 NDF + 0.13380 ADF + 0.07057 fat - 0.57029 ash - 0.02437 L (R2 = 0.70). The best-fit regression equation for TME content of DDGS was TME = 7.92283 + 0.51475 GE - 0.10003 NDF + 0.13380 ADF + 0.07057 fat - 0.57029 ash - 0.02437 L (R2 = 0.70).
This experiment suggested that measuring the chemical composition and color score of a corn DDGS sample may provide a quality parameter for identifying corn DDGS sources energy digestibility and metabolizable energy content.
本研究旨在评估 30 种玉米酒糟及其可溶物（DDGS）在成年公鸡中的表观代谢能（AME）和真代谢能（TME）含量，并建立基于其化学成分和颜色评分预测 AME 和 TME 值的预测方程。
来自中国 11 个省的几个加工厂和来自美国的其他 28 个玉米 DDGS 来源。对 DDGS 的代谢能（ME）含量进行分析，对颜色评分和化学成分（粗蛋白、粗脂肪、灰分、中性洗涤剂纤维、酸性洗涤剂纤维）进行测量，以预测 DDGS 中的 ME 方程。采用精确喂养公鸡试验，将每种 DDGS 样品以管饲（50 g）方式喂给成年公鸡。试验采用随机不完全区组设计，3 个时期。每个时期使用 95 只成年公鸡，其中 90 只喂 DDGS 样品，5 只禁食以估计基础内源性能量损失。
结果表明，AME 范围为 5.93 至 12.19 MJ/kg，TME 范围为 7.28 至 13.54 MJ/kg。ME 与灰分含量（-0.64，P<0.01）和 ME 与黄度评分（0.39，P<0.05）之间存在相关性。此外，基于化学成分和颜色评分，DDGS 的 AME 含量的最佳拟合回归方程为 AME=6.57111+0.51475 GE-0.10003 NDF+0.13380 ADF+0.07057 fat-0.57029 ash-0.02437 L（R2=0.70）。DDGS 的 TME 含量的最佳拟合回归方程为 TME=7.92283+0.51475 GE-0.10003 NDF+0.13380 ADF+0.07057 fat-0.57029 ash-0.02437 L（R2=0.70）。
本实验表明，测量玉米 DDGS 样品的化学成分和颜色评分可为识别玉米 DDGS 来源的能量消化率和代谢能含量提供质量参数。
