Abid Khalil, Jabri Jihene, Yaich Hela, Malek Atef, Rekhis Jamel, Kamoun Mohamed
Animal Nutrition Laboratory National School of Veterinary Medicine Sidi Thabet University of Manouba Sidi Thabet Tunisia.
Food Sci Nutr. 2022 Jan 23;10(6):1707-1713. doi: 10.1002/fsn3.2743. eCollection 2022 Jun.
This study explores the influence of different doses of two exogenous fibrolytic enzyme (EFE) additives (liquid (EFE: 1, 2, and 4 μΙ/g DM (dry matter)) and powder (EFE: 1, 2, and 4 mg/g DM)) on the chemical composition, fermentation characteristics, and nutritional value of brewer's spent grain (BSG). The results indicate that EFE at low doses does not affect the chemical composition, fermentation characteristics, and the nutritional value of BSG. The medium dose EFE decreases the fiber compound but increases the nonfiber carbohydrates (NFC) and soluble dry matter. Also, this dose modified the fermentation of BSG by increasing the amount of gas and its fermentation rate and decreasing the time between the inoculation and start of fermentation. Therefore, it increases the digestibility, metabolizable energy, net energy-lactation (NE), total volatile fatty acids, and the microbial crude protein production of BSG. The high dose of EFE decreases the fiber compound and increases the nonfiber carbohydrates and soluble dry matter; however, it also decreases the potential of gas production and does not affect the nutritional value of BSG. For EFE, all the doses do not modify the chemical composition, fermentation characteristics, and the nutritional value of BSG. These results suggest that the effectiveness of EFE varied, depending on the type of EFE and dose. Increase in the nutritional value of BSG by EFE at the medium dose can encourage breeders to use these wastes as feed at low cost in cow nutrition.
本研究探讨了两种外源纤维分解酶（EFE）添加剂的不同剂量（液体（EFE：1、2和4 μΙ/g干物质）和粉末（EFE：1、2和4 mg/g干物质））对啤酒糟（BSG）化学成分、发酵特性和营养价值的影响。结果表明，低剂量的EFE不会影响BSG的化学成分、发酵特性和营养价值。中等剂量的EFE可降低纤维化合物含量，但增加非纤维碳水化合物（NFC）和可溶性干物质含量。此外，该剂量通过增加气体量及其发酵速率并缩短接种与发酵开始之间的时间来改变BSG的发酵。因此，它提高了BSG的消化率、代谢能、泌乳净能（NE）以及总挥发性脂肪酸和微生物粗蛋白产量。高剂量的EFE降低了纤维化合物含量，增加了非纤维碳水化合物和可溶性干物质含量；然而，它也降低了产气潜力，且不影响BSG的营养价值。对于EFE而言，所有剂量均未改变BSG的化学成分、发酵特性和营养价值。这些结果表明，EFE的有效性因EFE类型和剂量而异。中等剂量的EFE提高了BSG的营养价值，这可能会鼓励养殖者在奶牛营养中以低成本将这些废弃物用作饲料。
