Feeding value improvement by co-fermentation of corn-ethanol co-product and agro-industrial residues with Rhizopus oryzae
Feeding value improvement by co-fermentation of corn-ethanol co-product and agro-industrial residues with Rhizopus oryzae
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DOI：
10.1016/j.procbio.2021.10.029
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发表时间：
2021-10-30
影响因子：
4.4
通讯作者：
Hu, Bo
中科院分区：
文献类型：
--
作者：
Sun, Xiao;Chen, Yan;Hu, Bo
玉米干酒糟可溶物（cDDGS）是单胃动物的饲料成分，但由于其不平衡的氨基酸、高纤维含量和抗营养化合物而具有有限的包含率。此外，cDDGS的生产是昂贵的和能源密集的。本研究探讨了玉米釜液与其他干农工残余物混合的真菌发酵，可以绕过能源密集型干燥过程，同时提高混合基质的营养价值。以菜籽粕、棉籽粕、甜菜浆和大豆船体为原料，采用根霉发酵WDGS，在28 ℃下发酵12 d。结果表明，短的孵育时间（4 d）有利于蛋白质和关键氨基酸谱的改善。C/N比大于3的基质混合物有效地减少了氨的产生。在WDGS与CM和SP混合发酵后，结构性碳水化合物（主要是葡聚糖，降解20- 30%）发生显著降低（p < 0.05）。SP或SH的所有混合比例以及CM或CSM的较低比例（小于50%）的底物显示植酸降解30- 75%。本研究证明了固态发酵提高WDGS和农业剩余物对单胃动物饲用价值的可行性。
Corn dried distiller's grain with solubles (cDDGS) is a feeding ingredient for monogastric animals but with limited inclusion rate due to its imbalanced amino acids, high fiber content, and anti-nutritional compounds. Moreover, production of cDDGS is costly and energy intensive. This study investigated fungal fermentation of corn stillage mixing with other dry agro-industrial residues which could by-pass the energy-intensive drying process while improving nutritional value of the mixed substrates. Rhizopus oryzae was used to ferment WDGS blended with canola meal (CM), cottonseed meal (CSM), sugar beet pulp (SP) and soybean hull (SH) at different ratio at 28 celcius for 12 days. Results suggested that short incubation period (4 days) was favorable for improvement of protein and key amino acids profile. Substrate mixture with C/N ratio above 3 effectively reduced ammonia generation. Significant reduction (p < 0.05) of structural carbohydrates (mainly glucan with degradation by 20-30 %) occurred after fermenting WDGS mixing with CM and SP. Substrate with all mixing ratio of SP or SH, and lower ratio (less than 50 %) of CM or CSM showed phytate degradation by 30-75 %. This study proved the feasibility of solid-state fermentation in improving feeding value of WDGS and agro-residues for monogastric animals.