University of New England, School of Environmental and Rural Science, Armidale, New South Wales, 2351, Australia; Curtin University, School of Molecular and Life Sciences, Bentley, Western Australia, 6152, Australia.
University of New England, School of Environmental and Rural Science, Armidale, New South Wales, 2351, Australia.
Poult Sci. 2022 Dec;101(12):102210. doi: 10.1016/j.psj.2022.102210. Epub 2022 Sep 30.
This study evaluated the impact of feeding xylo-oligosaccharides (XOS), fermentable fiber in the form of wheat bran (WB), and xylanase (XYL) on laying hen productive performance and nutrient digestibility. The hypothesis was that the WB would provide the microbiota in the hindgut with fermentable dietary xylan, and the XOS and XYL would further upregulate xylan fermentation pathways, resulting in improved nutrient utilization. Isa Brown hens (n = 96) were obtained at 39 wk of age. They were fed 12 dietary treatments, 8 hens per treatment, for 56 d. A commercial laying hen ration was fed, and for half of the treatments 10% of this ration was directly replaced with WB. The diets were then supplemented with either 1) no supplements; 2) XOS 50 g/t; 3) XOS 2000 g/t; 4) XYL (16,000 BXU/kg); 5) XYL + XOS 50 g/t, or 6) XYL + XOS 2,000 g/t. Hen performance and egg quality were measured every 14 d. On d56, ileum digesta samples were collected for determination of starch, nonstarch polysaccharide (NSP), XOS, protein, energy, and starch digestibility. Ceca digesta samples were also collected for analysis of XOS, short chain fatty acid (SCFA), xylanase and cellulase activity and microbial counts. Feeding 2,000 g/t XOS increased ileal protein digestibility. Combined 2,000 g/t XOS and XYL increased cecal Bifidobacteria concentration. This combination also increased cecal xylanase activity in birds fed the control diet. Cecal cellulase activity was improved by feeding WB, XYL, and 2,000 g/t XOS. XYL increased cecal lactate production. Feeding 2,000 g/t XOS with WB increased insoluble NSP degradability and shell breaking strength at d56. In summary, supplementing laying hen diets with fermentable fiber, XYL and XOS increases utilization of dietary xylan, improving nutrient utilization, performance, and gastrointestinal health.
本研究评估了饲粮中添加木寡糖（XOS）、作为可发酵纤维的麦麸（WB）和木聚糖酶（XYL）对蛋鸡生产性能和养分消化率的影响。研究假设 WB 会为后肠微生物提供可发酵的日粮木聚糖，而 XOS 和 XYL 会进一步上调木聚糖发酵途径，从而提高养分利用率。39 周龄时获得了伊莎褐蛋鸡（n=96）。它们被喂食 12 种饲粮处理，每种处理 8 只鸡，共 56 天。使用商业蛋鸡饲粮，其中一半的处理用 10%的 WB 直接替代。然后在饲粮中添加以下 1）无添加物；2）50 g/t 的 XOS；3）2000 g/t 的 XOS；4）16000 BXU/kg 的 XYL；5）50 g/t 的 XYL 和 XOS；或 6）2000 g/t 的 XYL 和 XOS。每隔 14 天测量一次鸡的生产性能和蛋品质。在第 56 天，收集回肠食糜样品，测定淀粉、非淀粉多糖（NSP）、XOS、蛋白质、能量和淀粉消化率。还收集盲肠食糜样品，分析 XOS、短链脂肪酸（SCFA）、木聚糖酶和纤维素酶活性以及微生物计数。饲粮添加 2000 g/t 的 XOS 提高了回肠蛋白质消化率。同时添加 2000 g/t 的 XOS 和 XYL 增加了盲肠双歧杆菌的浓度。这种组合还提高了对照组日粮中盲肠木聚糖酶的活性。饲粮添加 WB、XYL 和 2000 g/t 的 XOS 提高了盲肠纤维素酶的活性。XYL 增加了盲肠乳酸的产生。饲粮添加 2000 g/t 的 XOS 与 WB 提高了第 56 天不溶性 NSP 的降解率和蛋壳强度。综上所述，在蛋鸡饲粮中添加可发酵纤维、XYL 和 XOS 可提高日粮木聚糖的利用率，从而改善养分利用率、生产性能和胃肠道健康。
