Poultry Science Department, Texas A&M AgriLife Research, College Station, 101 Kleberg, College Station, TX 77843-2472, USA.
Kerry Inc, Beloit, WI 53511, USA.
Poult Sci. 2018 Sep 1;97(9):3149-3155. doi: 10.3382/ps/pey193.
Exogenous enzymatic supplementation of poultry feeds, including α-galactosidase and xylanase, has been shown to increase metabolically available energy, although little information has been published on the impact on amino acid digestibility. An experiment was conducted to investigate a multicarbohydrase containing α-galactosidase and xylanase on amino acid digestibility, ileal digestible energy (IDE), and CP in male broiler chicks. The experiment was a 2 × 2 (diet × enzyme) factorial arrangement with 15 replicates of 8 male broilers per replicate raised for 21 d in a battery setting. The 2 dietary treatments included a positive control (PC) and a negative control (NC) diet formulated to contain 2.5% less calculated AME and digestible amino acids. Each of these diets was fed with and without enzyme. Broilers were fed a starter diet from 0-14 d (crumble) and a grower from 14-21 d (pellet). Birds were sampled on day 21 to determine ileal amino acid digestibility, IDE, and CP digestibility. Titanium dioxide (TiO2) was used as an indigestible marker for the determination of digestibility coefficients. Total ileal amino acid digestibility was increased (P = 0.008) by 3.80% with the inclusion of enzyme. Methionine and lysine digestibility was improved (P < 0.05) with the inclusion of enzyme by 3.37% and 2.61%, respectively. Enzyme inclusion increased (P = 0.001) cysteine digestibility by 9.3%. Diet-influenced ileal amino acid digestibility with tryptophan, threonine, isoleucine, and valine digestibility being increased (P < 0.05) in the PC when compared to the NC. IDE was decreased (P = 0.037) in broilers fed the NC diet by 100 kcal/kg feed when compared to broilers fed the PC diet. Enzyme inclusion increased (P = 0.047) IDE value by 90 kcal/kg. Crude protein digestibility was not influenced by diet; however, similar improvements in CP digestibility with enzyme inclusion were observed as with energy. These data support the benefits of a multicarbohydrase containing α-galactosidase and xylanase inclusion to improve nutrient and ileal amino acid digestibility across multiple dietary nutrient profiles.
家禽饲料中添加外源酶，包括α-半乳糖苷酶和木聚糖酶，已被证明可以增加代谢可用能量，尽管关于其对氨基酸消化率的影响的信息很少。进行了一项实验，研究了一种含有α-半乳糖苷酶和木聚糖酶的多聚糖酶对氨基酸消化率、回肠可消化能（IDE）和肉鸡雏鸡粗蛋白（CP）的影响。该实验采用 2×2（饲粮×酶）因子设计，每个重复 15 只雄性肉鸡，在笼养条件下饲养 21 天。两种饲粮处理包括阳性对照（PC）和阴性对照（NC）饲粮，计算得出的 AME 和可消化氨基酸含量低 2.5%。这两种饲粮都添加了或不添加酶。肉鸡在 0-14 日龄时喂给起始饲粮（碎粒），14-21 日龄时喂给生长饲粮（颗粒）。在第 21 天采样以确定回肠氨基酸消化率、IDE 和 CP 消化率。二氧化钛（TiO2）用作不消化标记物以确定消化率系数。添加酶可使总回肠氨基酸消化率提高 3.80%（P=0.008）。添加酶可分别使蛋氨酸和赖氨酸的消化率提高 3.37%和 2.61%（P<0.05）。添加酶可使胱氨酸的消化率提高 9.3%（P=0.001）。饲粮影响回肠氨基酸消化率，与 NC 饲粮相比，PC 饲粮中色氨酸、苏氨酸、异亮氨酸和缬氨酸的消化率增加（P<0.05）。与 PC 饲粮相比，NC 饲粮中肉鸡的回肠可消化能降低（P=0.037）100kcal/kg 饲料。添加酶可使 IDE 值提高 90kcal/kg（P=0.047）。饲粮对粗蛋白消化率没有影响；然而，与能量相似，添加酶也可提高 CP 消化率。这些数据支持在含有α-半乳糖苷酶和木聚糖酶的多聚糖酶中添加酶以提高多种饲粮营养物质和回肠氨基酸消化率的益处。
