Department of Poultry Science, Center of Excellence for Poultry Science, University of Arkansas, Fayetteville 72701.
Cobb-Vantress, Siloam Springs 72761, AR.
Poult Sci. 2019 Sep 1;98(9):4048-4057. doi: 10.3382/ps/pez079.
An initial study profiled non-cellulosic polysaccharide (NCP) levels in feed ingredient samples-corn, soybean meal (SBM), whole soybean, and distillers dried grains with solubles (DDGS). A separate NCP digestibility assay was performed in broilers at day 21 (grower phase) and day 42 (finisher phase) fed corn-soy based diets with and without composite enzymes (phytases, multi-carbohydrases, and proteases). Negative control (NC), NC + composite enzymes (NC+E), and positive control (PC) diets were tested. Negative control and NC + E diets were isocaloric, 3,020 kcal/kg ME at grower phase and 3,026 kcal/kg ME at finisher phase. Positive control diet was formulated to meet the Cobb standard nutrient specifications. Diets, pooled digesta, and excreta samples from all treatment diets were collected from 21- and 42-day-old birds and NCP content analyzed as soluble NCP (S-NCP) and insoluble NCP (I-NCP) fractions. Digestibility coefficient (DC) values were determined for all dietary treatments for both the feeding periods. Results from the ingredient analysis showed NCP levels of ∼7 to 10% in corn samples, ∼8 to 11% in SBM samples, ∼11 to 14% (including pectin level) in whole soybean, and ∼12 to 17% in DDGS samples, suggesting variation (P < 0.05) in NCP levels existed within ingredient samples. Digestibility assays showed that enzyme treated (NC + E) diet improved DC values at day 21 from 6 to 10 units and 6 to 9 units for ileal and total tract collection, respectively, for I-NCP fraction (P < 0.05) compared to DC values for NC or PC diets. The ileal DC values at day 42 were not different between treatment diets (∼0.6) but total tract DC values improved 9 to 11 units for broilers fed NC + E diet compared to NC or PC diets. Higher DC values for S-NCP were observed for all treatments for both feeding periods (∼0.7-ileal and ∼0.8-total tract) compared to DC values for I-NCP. Overall, the use of supplemental enzymes in corn-soy-based diets showed improvement in total NCP digestion.
一项初步研究分析了饲料成分样本（玉米、豆粕、全大豆和玉米酒糟及其可溶物）中的非纤维性多糖（NCP）水平。在 21 日龄（生长期）和 42 日龄（育肥期）的肉鸡中进行了单独的 NCP 消化率测定，这些肉鸡喂食的是含或不含复合酶（植酸酶、多聚糖酶和蛋白酶）的玉米-豆粕基础日粮。测试了阴性对照（NC）、NC+复合酶（NC+E）和阳性对照（PC）日粮。NC 和 NC+E 日粮的能量值相等，生长期为 3020kcal/kg 代谢能，育肥期为 3026kcal/kg 代谢能。阳性对照日粮是根据考伯标准营养规格配制的。收集了所有处理日粮 21 日龄和 42 日龄的鸡的日粮、混合消化物和排泄物样本，并分析了 NCP 含量，分为可溶性 NCP（S-NCP）和不溶性 NCP（I-NCP）。在两个饲养阶段都确定了所有日粮处理的消化系数（DC）值。成分分析结果显示，玉米样本中的 NCP 含量约为 7-10%，豆粕样本中的 NCP 含量约为 8-11%，全大豆中的 NCP 含量约为 11-14%（包括果胶含量），DDGS 样本中的 NCP 含量约为 12-17%，表明成分样本中的 NCP 水平存在差异（P<0.05）。消化率测定表明，与 NC 或 PC 日粮相比，酶处理（NC+E）日粮在第 21 天分别提高了回肠和全肠道收集的 I-NCP 分数的 DC 值 6-10 个单位和 6-9 个单位（P<0.05）。第 42 天，处理日粮之间的回肠 DC 值没有差异（约 0.6），但与 NC 或 PC 日粮相比，喂食 NC+E 日粮的肉鸡的全肠道 DC 值提高了 9-11 个单位。两个饲养阶段，所有处理的 S-NCP 的 DC 值都较高（回肠约为 0.7，全肠道约为 0.8），高于 I-NCP 的 DC 值。总的来说，在玉米-豆粕日粮中添加补充酶可提高总 NCP 的消化率。
